![[High-Performance C++ Engine #1] Why Legacy Win32/MFC Trading Systems Freeze at the 9:00 AM Market Open](/images/cpp_hts_market_data_engine_series/img_part1_legacy_hts_ui_freezing_bottlenecks.webp)
Why Legacy Win32/MFC Trading Systems Freeze at the 9:00 AM Market Open
An architectural dissection of why multi-decade Win32/MFC desktop trading platforms suffer from severe UI freezing during the 09:00 AM market open packet surge.
Read Full Story →ARCHITECTURAL NOTES · AI AUTOMATION · CULTURAL ESSAYS
Systems, Intelligence,
& Human Insight.
RICO STUDIO is an independent digital showroom and engineering publication. We document ultra-low-latency C++26 systems, autonomous AI production pipelines, and essays on culture and creative resilience.
01
COVER STORY & EDITOR’S PICKS
SELECTED DEEP DIVES
INDEX 01—03
01
Zero-Mutex Market Data Engine — Symbol Hash Sharding & Lock-Free RCU/CoW
How we implemented symbol-hash worker sharding and Lock-Free Read-Copy-Update (RCU) snapshot slots with Copy-on-Write so tens of thousands of real-time mar…
02
Multi-Exchange (Primary + ATS) Real-Time 10-Level OrderBook Synthesis & Out-of-Order Determinism
How we deterministically synthesize Primary Exchange and Alternative Exchange (ATS) orderbooks in real time, and prevent out-of-order races between Expecte…
03
Let the UI Thread Only Paint — ScreenWorker Background Formatting & 64MB Ring-Buffer Virtual Grid
How we offloaded 28 display field formatting operations to background ScreenWorkers with Double Dirty Coalescing, built an O(1) 64MB ring-buffer VirtualGri…
02
INTERACTIVE ARCHIVE SHOWROOM
Why Legacy Win32/MFC Trading Systems Freeze at the 9:00 AM Market Open
An architectural dissection of why multi-decade Win32/MFC desktop trading platforms suffer from severe UI freezing during the 09:00 AM market open packet surge.
![[High-Performance C++ Engine #2] Zero-Mutex Market Data Engine — Symbol Hash Sharding & Lock-Free RCU/CoW](/images/cpp_hts_market_data_engine_series/img_part2_sharded_ingestion_lockfree_rcu.webp)
Zero-Mutex Market Data Engine — Symbol Hash Sharding & Lock-Free RCU/CoW
How we implemented symbol-hash worker sharding and Lock-Free Read-Copy-Update (RCU) snapshot slots with Copy-on-Write so tens of thousands of real-time mar…
![[High-Performance C++ Engine #3] Multi-Exchange (Primary + ATS) Real-Time 10-Level OrderBook Synthesis & Out-of-Order Determinism](/images/cpp_hts_market_data_engine_series/img_part3_multi_exchange_state_projection.webp)
Multi-Exchange (Primary + ATS) Real-Time 10-Level OrderBook Synthesis & Out-of-Order Determinism
How we deterministically synthesize Primary Exchange and Alternative Exchange (ATS) orderbooks in real time, and prevent out-of-order races between Expecte…
![[High-Performance C++ Engine #4] Let the UI Thread Only Paint — ScreenWorker Background Formatting & 64MB Ring-Buffer Virtual Grid](/images/cpp_hts_market_data_engine_series/img_part4_screen_worker_virtual_grid.webp)
Let the UI Thread Only Paint — ScreenWorker Background Formatting & 64MB Ring-Buffer Virtual Grid
How we offloaded 28 display field formatting operations to background ScreenWorkers with Double Dirty Coalescing, built an O(1) 64MB ring-buffer VirtualGri…
![[High-Performance C++ Engine #5] 1% CPU & 1-Second Lag War Stories (Message Storms, ActiveX Batching, 60-Cell Clipping)](/images/cpp_hts_market_data_engine_series/img_part5_micro_optimizations_troubleshooting.webp)
1% CPU & 1-Second Lag War Stories (Message Storms, ActiveX Batching, 60-Cell Clipping)
How we hunted down and eliminated three subtle production bottlenecks—423/s Win32 message storms, ActiveX COM per-cell redraw overhead, and a 1-second quot…
![[High-Performance C++ Engine #6] Production Scorecard (UI Freeze 1,531ms → 15ms) & Zero-Downtime Dual-Path Rollout](/images/cpp_hts_market_data_engine_series/img_part6_production_metrics_dual_path.webp)
Production Scorecard (UI Freeze 1,531ms → 15ms) & Zero-Downtime Dual-Path Rollout
The complete 540-second market open benchmark scorecard comparing AS-IS vs. TO-BE, alongside our Dual-Path rollout architecture and engineering lessons fro…
![[Cross-Platform DevLog #1] Rebuilding an Abandoned Pomodoro App — Why 'Lo-Fi Focus Studio' and 'Focus-to-Earn'?](/images/pomodoro_v2_devlog_series/slide1.webp)
Rebuilding an Abandoned Pomodoro App — Why 'Lo-Fi Focus Studio' and 'Focus-to-Earn'?
How we tore down a neglected v1.0 white-screen timer app and rebuilt So Simple Pomodoro v2.0 across Android, iOS, watchOS, and Wear OS with a dark Lo-Fi Fo…
![[Cross-Platform DevLog #2] Balancing Monetization and Fairness — Rewarded Ads & a 4-Layer Anti-Abuse Architecture](/images/pomodoro_v2_devlog_series/slide2.webp)
Balancing Monetization and Fairness — Rewarded Ads & a 4-Layer Anti-Abuse Architecture
How we designed a zero-interruption opt-in Google AdMob rewarded ad model and engineered a 4-layer anti-abuse defense pipeline spanning client wall-clock v…
![[Cross-Platform DevLog #3] "Synthetic Audio Sounds Fake" — Adopting Google Studio Field Recordings & a Multi-Channel Ambient Mixer](/images/pomodoro_v2_devlog_series/slide3.webp)
"Synthetic Audio Sounds Fake" — Adopting Google Studio Field Recordings & a Multi-Channel Ambient Mixer
Why we scrapped two iterations of mathematical PCM white-noise synthesis (24MB WAVs & loop gaps) in favor of 3.1MB Google Actions Sound Library OGG field r…
![[Cross-Platform DevLog #4] Bypassing the iOS 26 JIT Memory Protection Crash & Crafting the Apple Watch Series 10 Circular UI](/images/pomodoro_v2_devlog_series/slide4.webp)
Bypassing the iOS 26 JIT Memory Protection Crash & Crafting the Apple Watch Series 10 Circular UI
How we diagnosed and bypassed the iOS 26.3.1 real-device Flutter Debug JIT crash (EXC_BAD_ACCESS / SIGKILL / brk #0xf00d caused by Apple's TXM kernel monit…
![[Cross-Platform DevLog #5] A Timer That Never Stops — Mastering Android Doze, iOS Silent Audio Loops, and Bidirectional Watch Sync](/images/pomodoro_v2_devlog_series/slide5.webp)
A Timer That Never Stops — Mastering Android Doze, iOS Silent Audio Loops, and Bidirectional Watch Sync
The finale of our 5-part series: how we engineered wall-clock persistence (targetEndEpochMs) that survives swipe-kills, iOS in-memory silent PCM WAV loops,…
![[Life Strategy/Success] Being Busy Is Not the Same as Moving Forward — 'Vanishing Work' vs. 'Accumulating Work'](/images/youtube-wisdom-notes/slide9.webp)
Being Busy Is Not the Same as Moving Forward — 'Vanishing Work' vs. 'Accumulating Work'
Two friends burned the midnight oil every night—one reading books, the other weaving straw sandals to sell the next morning. Years later, their fates diver…
![[Carl Jung's Inner Lesson] The Most Elegant Revenge Against People Who Pull You Down — The 10-Year Soup Shop Story](/images/youtube-wisdom-notes/slide8.webp)
The Most Elegant Revenge Against People Who Pull You Down — The 10-Year Soup Shop Story
When a copycat shop opened right next door with a cheaper price and similar sign, a 10-year soup shop owner won without ever fighting. Explore Carl Jung's …
![[Cognitive Psychology/Wealth] The Defining Trait of Self-Made Rich People — Designing Work Like a Game With Immediate Feedback](/images/youtube-wisdom-notes/slide7.webp)
The Defining Trait of Self-Made Rich People — Designing Work Like a Game With Immediate Feedback
Cognitive psychologist Prof. Kim Kyung-il explains why removing feedback turns any game into grueling labor—and how self-made wealthy individuals design st…
![[Schopenhauer's Life Lesson] Why You Should Never Fight Low-Level People — The Fable of the Boar and the Leopard](/images/youtube-wisdom-notes/slide6.webp)
Why You Should Never Fight Low-Level People — The Fable of the Boar and the Leopard
When a leopard leaped into a mud pit to subdue a taunting wild boar, the leopard won the fight in seconds—yet lost everything that mattered. A timeless les…
![[Dark Psychology/Wisdom] 6 Things Successful People Never Say Out Loud — Why Silence Protects Your Goals](/images/youtube-wisdom-notes/slide5.webp)
6 Things Successful People Never Say Out Loud — Why Silence Protects Your Goals
"99% of shattered dreams leak through the mouth." Explore why keeping your blueprints, good deeds, and family matters private protects your momentum from e…
![[Reading/Execution] The One Truth Learned After Reading 10,000 Books — "Stop Knowledge Addiction and Move Today"](/images/youtube-wisdom-notes/slide4.webp)
The One Truth Learned After Reading 10,000 Books — "Stop Knowledge Addiction and Move Today"
Reading more books can easily trap you in the illusion that knowing more equals growing. Discover the 5 radically simple action principles at the end of 10…
![[Psychology/Relationships] 4 Practical Psychological Techniques to Read People's True Feelings for Life](/images/youtube-wisdom-notes/slide3.webp)
4 Practical Psychological Techniques to Read People's True Feelings for Life
People can fake a smile, but they rarely fake the direction of their feet, their split-second gaze when laughing, or their reaction to silence. Master 4 ti…
![[Self-Improvement/Routine] What People With Effortless Mornings Do Before Bed — Machiavelli's 5-Minute Night Design](/images/youtube-wisdom-notes/slide2.webp)
What People With Effortless Mornings Do Before Bed — Machiavelli's 5-Minute Night Design
The difference between a chaotic morning and a calm morning lies not in waking up early, but in the 5 minutes before sleep. Discover the 4-step night routi…
![[Philosophy/Habits] The 'One Hour a Day' Rule That Makes You a Completely Different Person in 5 Years (Schopenhauer's Insight)](/images/youtube-wisdom-notes/slide1.webp)
The 'One Hour a Day' Rule That Makes You a Completely Different Person in 5 Years (Schopenhauer's Insight)
How showing up for just one hour every single day—through rain, overtime, and months of invisible progress—transforms an ordinary person over 5 years, view…
Why Park Jinyoung Says You Need Complete Despair in Life
When life stops going our way, most of us scramble to escape despair as quickly as possible. But Park Jinyoung (J.Y. Park) — the man who has led JYP Entert…
![[C++] Tracking & Resolving Zombie Process Bugs in Large-Scale MFC HTS Architecture](/images/cpp_mfc_hts_zombie_process_fix/img_mfc_zombie_process_architecture.webp)
Tracking & Resolving Zombie Process Bugs in Large-Scale MFC HTS Architecture
Enterprise financial Home Trading Systems (HTS) operate on massive C++/MFC codebases spanning decades of development. Following the integration of a new hi…
![[C++] How C++ Static Reflection Will Transform Serialization Architecture](/images/cpp26_static_reflection_serialization/img_cpp26_reflection_vs_legacy_serialization.webp)
How C++ Static Reflection Will Transform Serialization Architecture
Serializing objects to disk, network packets, or JSON format in C++ has traditionally been a painful compromise. Developers were forced to inject invasive …
![[C++] C++26 Flat Containers & Hazard Pointers: Ultra Low-Latency Data Pipeline Design](/images/cpp26_flat_containers_hazard_pointer/img_cpp26_map_vs_flat_map_cache_locality.webp)
C++26 Flat Containers & Hazard Pointers: Ultra Low-Latency Data Pipeline Design
In financial HTS and High-Frequency Trading (HFT) platforms, order book snapshots and market quotes reside on the nanosecond-critical read path. Traditiona…
![[C++] std::execution & Senders/Receivers: Foundations of High-Performance Concurrency](/images/cpp26_std_execution_senders_receivers/img_cpp26_execution_vs_legacy_futures.webp)
std::execution & Senders/Receivers: Foundations of High-Performance Concurrency
Asynchronous and parallel programming in C++ has historically been burdened with fragmented primitives. std::thread, std::future, and std::promise introduc…
![[C++] C++26 Contracts & Static Reflection: Paradigm Shifts in HTS & Low-Latency Trading Architecture](/images/cpp26_contracts_static_reflection_trading/img_cpp26_contracts_reflection_trading_core.webp)
C++26 Contracts & Static Reflection: Paradigm Shifts in HTS & Low-Latency Trading Architecture
In ultra-low-latency financial trading infrastructure—spanning Home Trading Systems (HTS) and High-Frequency Trading (HFT)—C++26 marks a historic watershed…
![[C++] HTS Real-time Data Architecture: Adaptive Throttling & Trailing Edge Flush](/images/cpp_hts_realtime_adaptive_throttling/img_cpp_hts_throttling_architecture.webp)
HTS Real-time Data Architecture: Adaptive Throttling & Trailing Edge Flush
In ultra-high-speed financial trading software like Home Trading Systems (HTS), market opening moments or extreme market volatility trigger sudden surges w…
![[C++/MFC] Fast Code String Parsing: Zero-Copy & Zero-Allocation Optimization Guide](/images/cpp_mfc_fast_string_parsing/img_cpp_mfc_fast_parsing_comparison.webp)
Fast Code String Parsing: Zero-Copy & Zero-Allocation Optimization Guide
In financial trading systems (HTS/MTS) and real-time market data feed engines, parsing delimiter-separated stock code strings (delimited by ; or ,) hundred…
![[AI/Dev] Automated AI Video Generation with Claude Code & Remotion: 3 Critical Failures & 5 Golden Principles (2026)](/images/remotion_claude_video_automation/img_remotion_claude_code_architecture.webp)
Automated AI Video Generation with Claude Code & Remotion: 3 Critical Failures & 5 Golden Principles (2026)
Sunday, August 23, 2026 — Without ever opening traditional video editing tools like Adobe Premiere Pro or After Effects, turning raw text scripts into high…
![[AI/Monetization] 8 Practical Business Models to Monetize AI Videos with Higgsfield & Claude MCP (2026)](/images/higgsfield_ai_video_monetization/img_higgsfield_ai_pipeline_overview.webp)
8 Practical Business Models to Monetize AI Videos with Higgsfield & Claude MCP (2026)
Sunday, August 23, 2026 — Following the rapid maturation of text and image generation, generative AI video technologies are empowering solo creators and so…
![[C++] C++26 std::inplace_vector, Zero-Allocation High-Performance Containers, and Lock-Free Hazard Pointers Guide (2026)](/images/cpp26_inplace_vector_hazard_ptr/img_cpp26_heap_bottleneck_zero_allocation.webp)
C++26 std::inplace_vector, Zero-Allocation High-Performance Containers, and Lock-Free Hazard Pointers Guide (2026)
Sunday, August 23, 2026 — For systems engineers building High-Frequency Trading (HFT) platforms, AAA game engines, real-time DSP pipelines, and embedded ke…
![[C++/IDE] Visual Studio 2026 MSVC v14.50 Deep Dive: 100% C++23 STL, C++26 Pack Indexing, and Massive Build Optimization (2026)](/images/vs2026_msvc_v1450/img_vs2026_msvc_v1450_core_highlights.webp)
Visual Studio 2026 MSVC v14.50 Deep Dive: 100% C++23 STL, C++26 Pack Indexing, and Massive Build Optimization (2026)
Sunday, August 23, 2026 — As the primary development environment for Windows systems, AAA game development, and high-performance infrastructure, Visual Stu…
![[Web/Performance] High-Performance Web Architecture with WebAssembly (Wasm): Porting Native C++/Rust to Browsers and Enterprise Case Studies (2026)](/images/webassembly_high_performance/img_wasm_js_vs_wasm_architecture.webp)
High-Performance Web Architecture with WebAssembly (Wasm): Porting Native C++/Rust to Browsers and Enterprise Case Studies (2026)
Sunday, August 23, 2026 — Despite rapid advances in web standards, building desktop-class web applications—such as real-time massive data visualizers, CAD/…
![[C++] C++26 Static Reflection Deep Dive: ^^ Operator, [: :] Splice, and Macro-Free Serialization (2026)](/images/cpp26_static_reflection/img_cpp26_reflection_concept_comparison.webp)
C++26 Static Reflection Deep Dive: ^^ Operator, [: :] Splice, and Macro-Free Serialization (2026)
Saturday, August 22, 2026 — The most groundbreaking paradigm shift currently unfolding in the modern C++ ecosystem is the official tooling adoption of C++2…
![[AI/Productivity] Building an AI Solopreneur Business EP1: Data-Driven Idea Validation (2026)](/images/ai_solopreneur_ep1/img_ai_solopreneur_ep1_3principles.webp)
Building an AI Solopreneur Business EP1: Data-Driven Idea Validation (2026)
Saturday, August 22, 2026 — With generative AI tearing down traditional technical barriers, the ambition to launch and operate a full-scale digital venture…
![[AI/Productivity] 5 Proven Claude AI Monetization Workflows for Solo Creators & Engineers (2026)](/images/claude_monetization/img_claude_monetization_models_comparison.webp)
5 Proven Claude AI Monetization Workflows for Solo Creators & Engineers (2026)
Saturday, August 22, 2026 — Watching the rapid evolution of generative AI, I found myself deeply reflecting on a critical question: "Beyond simple coding a…
![[Life/Philosophy] Why Heaven Only Bestows Severe Hardships on Great Souls: Wisdom from Mencius & Nietzsche](/images/hardship_builds_greatness/img_greenhouse_vs_post_traumatic_growth.webp)
Why Heaven Only Bestows Severe Hardships on Great Souls: Wisdom from Mencius & Nietzsche
Saturday, August 22, 2026 — On a peaceful weekend afternoon, I reflect on a short video about life's tribulations and personal growth that left a profound …
![[C++] Troubleshooting PDB Mismatch in Windows Dump Analysis & Crash Code Tracing Guide](/images/windows_dump_pdb_mismatch_debugging/img_pe_rsds_pdb_guid_matching_mechanism.webp)
Troubleshooting PDB Mismatch in Windows Dump Analysis & Crash Code Tracing Guide
Saturday, August 22, 2026 — When maintaining large-scale C++ systems (HTS clients, gaming servers/engines, high-frequency trading infrastructure), engineer…
![[Life/Insight] Why People Without Friends Are Truly Feared: The Power of Solitude](/images/why_people_without_friends_are_feared/img_dependent_vs_solitude_comparison.webp)
Why People Without Friends Are Truly Feared: The Power of Solitude
Friday, August 21, 2026 — As I wrap up the day, I reflect on a short video about human relationships that left a lasting impression on me. When people noti…
![[Psychology/Mindset] 10 Traits of People You Should Never Make Enemies With: Carl Jung's Inner Wisdom](/images/10-traits-of-people-you-should-never-make-enemies-with/silence-and-boundaries-inner-power.webp)
10 Traits of People You Should Never Make Enemies With: Carl Jung's Inner Wisdom
Reflecting on psychological insights, interpersonal dynamics, and inner mastery on Friday, August 21, 2026. The most formidable individuals in this world a…
![[Music/Entertainment] Singer Stella Jang Recent Updates: 2nd Album, SJF 2026 & Global Stages](/images/stella-jang-recent-news/stella-jang-portrait.webp)
Singer Stella Jang Recent Updates: 2nd Album, SJF 2026 & Global Stages
Tracking the latest Korean music news and recent activities of acclaimed singer-songwriter Stella Jang on Friday, August 21, 2026. Celebrated for her cryst…
![[Life/Psychology] 6 Basic Manners That Reveal a Person's True Character: Everyday Courtesy](/images/6-basic-manners-reveal-character/dining-and-walking-manners.webp)
6 Basic Manners That Reveal a Person's True Character: Everyday Courtesy
Reflecting on human character, relationships, and everyday courtesy on Friday, August 21, 2026. A person's true character and inner elegance are never dete…
![[Entertainment] Actress Shin Se-kyung Recent Updates: 10-Year Screen Return in HUMINT & New Dramas](/images/shin-se-kyung-recent-news/shin-se-kyung-portrait.webp)
Actress Shin Se-kyung Recent Updates: 10-Year Screen Return in HUMINT & New Dramas
Tracking the latest Korean entertainment news and activities of celebrated actress Shin Se-kyung on Thursday, August 20, 2026. Known for her serene grace, …
![[Entertainment] Actress Yoo In-na Recent Updates: New Agency, 2026 Dramas, and Goblin 10th Anniversary](/images/yoo-in-na-recent-news/yoo-in-na-portrait.webp)
Actress Yoo In-na Recent Updates: New Agency, 2026 Dramas, and Goblin 10th Anniversary
Tracking the latest Korean entertainment news and updates on beloved actress Yoo In-na on Thursday, August 20, 2026. Renowned for her radiant charm, soothi…
![[Philosophy/Life] Endure and Prevail: The Power of Resilience from Nietzsche's Übermensch](/images/endure-and-prevail/storm-and-deep-rooted-tree.webp)
Endure and Prevail: The Power of Resilience from Nietzsche's Übermensch
Reflecting on philosophical endurance and resilience on Thursday, August 20, 2026. In the course of life, everyone inevitably encounters fierce storms—mome…
![[Self-Growth/Wealth] 7 Surprisingly Simple Habits to Build Wealth: Small Daily Actions](/images/7-wealth-habits/7-simple-wealth-habits.webp)
7 Surprisingly Simple Habits to Build Wealth: Small Daily Actions
Reflecting on daily productivity habits and wealth mindsets on Wednesday, August 19, 2026. "How can one build sustainable wealth and achieve financial and …
![[Psychology/Life] Why Those Who Survived Hell Alone Are Truly Unshakable: Extreme Resilience](/images/surviving-hell-alone/4-core-psychological-features.webp)
Why Those Who Survived Hell Alone Are Truly Unshakable: Extreme Resilience
Reflecting on deep psychological resilience and mental fortitude on Wednesday, August 19, 2026. In life, almost everyone encounters moments of absolute dar…
![[Philosophy/Life] Nietzsche's Wisdom for the Second Half of Life: Solitude and Curating Relationships](/images/nietzsche-second-half/nietzsche-7-life-principles.webp)
Nietzsche's Wisdom for the Second Half of Life: Solitude and Curating Relationships
Reflecting on life lessons and philosophical insights on Wednesday, August 19, 2026. As the years add up, many of us inevitably ponder: "How should I navig…
![[K-Drama/Review] Top Anticipated 2026 Netflix & K-Dramas: Song Hye-kyo, Gong Yoo, Son Ye-jin Lineup](/images/kdrama-2026-lineup/song-hye-kyo-show-business.webp)
Top Anticipated 2026 Netflix & K-Dramas: Song Hye-kyo, Gong Yoo, Son Ye-jin Lineup
Sharing my excitement and preview of the most anticipated K-dramas on Wednesday, August 19, 2026. As we cross the midpoint of 2026, global streaming platfo…
![[AI/Dev] Claude Code vs Gemini CLI: A Hands-on Comparison for Developers (2026)](/images/claude-code-vs-gemini-cli/claude-code-vs-gemini-cli-spec.webp)
Claude Code vs Gemini CLI: A Hands-on Comparison for Developers (2026)
Reflecting on terminal AI coding agent workflows on Wednesday, August 19, 2026. The most transformative trend in modern software engineering is the rise of…
![[Star/Review] Park Eun-bin's Latest Highlights: From Netflix's The WONDERfools to Spellbound (2026)](/images/park-eun-bin/park-eun-bin-official-portrait.webp)
Park Eun-bin's Latest Highlights: From Netflix's The WONDERfools to Spellbound (2026)
Sharing my admiration and notes on actress Park Eun-bin on Wednesday, August 19, 2026. When asked to name a truly indispensable, versatile Korean actress, …
![[AI/Productivity] Extracting JSON Style Guides from PPTX Templates for AI Automation (2026)](/images/pptx-json-styleguide/pptx-to-json-concept.webp)
Extracting JSON Style Guides from PPTX Templates for AI Automation (2026)
Documenting my automation experiments on Wednesday, August 19, 2026. One of the most tedious parts of preparing executive presentations and business report…
![[AI/Comparison] Gemini 3.7 Flash vs 3.1 Pro: A Paid User's Honest Selection Guide (2026)](/images/gemini-3-7-flash-vs-3-1-pro/gemini-3-7-flash-features.webp)
Gemini 3.7 Flash vs 3.1 Pro: A Paid User's Honest Selection Guide (2026)
Recording my notes and impressions comparing Google's latest AI models on Wednesday, August 19, 2026. As an active paid subscriber to Google AI Pro (Google…
Schopenhauer’s 4 Uncomfortable Truths About Human Nature: How to Protect Your Inner Peace
Throughout our lives, we navigate an intricate web of relationships. Family, friendships, and workplace colleagues often bring warmth and community, yet th…
![[AI/Dev] How to Build Gemini CLI Subagents: A Complete .gemini/agents Setup Guide (2026)](/images/gemini_cli_subagent/img_gemini_subagent_setup_flow.webp)
How to Build Gemini CLI Subagents: A Complete .gemini/agents Setup Guide (2026)
Tuesday, August 18, 2026 — these are my notes on building Gemini CLI subagents, from start to finish. Let me start with the conclusion. "Creating a Gemini …
From a Single Prompt to Full Publishing: Building an AI Blog Automation Pipeline with Claude Cowork and n8n
When running a tech blog, what takes the most time and cognitive effort? It is rarely the physical act of typing. Rather, it is the entire workflow: brains…
![[macOS] Photos Stuck Downloading Originals After Migrating to a New Mac: Diagnosing and Fixing a Frozen iCloud Photos Sync](/images/macbook_air_m5/macbook_air_m5.webp)
Photos Stuck Downloading Originals After Migrating to a New Mac: Diagnosing and Fixing a Frozen iCloud Photos Sync
You buy a new MacBook and use Migration Assistant to bring everything over from the old one. On the surface everything looks fine — until you try to edit a…
9 Daily Habits to Change Your Life Inspired by Friedrich Nietzsche
In our busy daily routines, small yet essential habits are easily overlooked. Recently, I stumbled upon a YouTube Short video titled "Habits Nietzsche Emph…
Windows IPC & Memory Management Architecture: From WM_COPYDATA to Lock-Free MPMC Shared Memory
When engineering high-frequency trading (HFT/HTS) systems or mission-critical C++ applications where zero runtime exceptions are permitted, understanding I…
![[Daily/Seoul] Convenient Lunch in Euljiro! 'Soban' Boneless Samgyetang (Ginseng Chicken Soup) & Hot Pot Rice](/images/euljiro_soban/img_euljiro_soban_menu_1.webp)
Convenient Lunch in Euljiro! 'Soban' Boneless Samgyetang (Ginseng Chicken Soup) & Hot Pot Rice
During busy weekdays in Seoul, enjoying a nourishing lunch is the best way to recharge energy. A couple of days ago, I visited 'Hansik Gonggan Soban' in Eu…
![[Daily/Seoul] Myeongdong Cathedral Underground 'Gaon': Chogye-guksu (Cold Chicken Noodles) & Holy Art Shop](/images/myeongdong_gaon/img_gaon_banchan.webp)
Myeongdong Cathedral Underground 'Gaon': Chogye-guksu (Cold Chicken Noodles) & Holy Art Shop
Taking a break during a busy weekday lunch hour always brings a refreshing sense of peace. Yesterday, I headed to the 1898 Plaza located in the underground…
External SSD Setup & Disk Space Diet Guide for Mac Developers
When developing web, mobile, or AI agent applications on a base MacBook (256GB / 512GB), you eventually run into the dreaded "Your disk is almost full" ale…
![[IT/Dev] Complete Guide to Refunding an Accidental Claude API Auto-recharge Charge of $49.50](/images/img_claude_refund_1.webp)
Complete Guide to Refunding an Accidental Claude API Auto-recharge Charge of $49.50
💡 The Problem and Why It Happens You bought $5.00 in initial credit to start using the Claude API, and the confirmation text showed a charge of $5.50 (incl…
![[Daily Life/Game] A Long-Awaited Day Off — Clearing Throné's Chapter 2 in Octopath Traveler II!](/images/octopath2-throned-ch2-img1.webp)
A Long-Awaited Day Off — Clearing Throné's Chapter 2 in Octopath Traveler II!
I took a weekday off for the first time in a while and spent the whole day completely at ease. There's really nothing quite as restful and rejuvenating as …
Beating Vercel's Storage Limits: Uploading High-Resolution Photos and Optimizing Images on a Static Blog
When you run a static blog on the Hugo + Vercel combo, posting something photo-heavy — a travel log or a restaurant review, say — brings up one nagging wor…
Adding Categories to the PaperMod Theme and Setting Up a Clean Classification System
When you run a dev blog on Hugo (PaperMod theme), a static site generator, you'll eventually want to add posts that go beyond tech write-ups -- daily life,…
Setting Up a Favicon in the PaperMod Theme and Fully Resolving RealFaviconGenerator Errors
When you run a blog or website, the favicon — that small icon shown in the browser tab — is a surprisingly important part of your brand identity. While mig…
Advanced HTS Real-Time Market Data Processing: Handling Multiple PB Service Feeds and Per-Symbol Parallelism (CAS vs Shared Mutex)
In the previous post, I designed the skeleton of a lock-free architecture that combines a custom deleter for std::shared_ptr with an object pool (Object Po…
Real-Time Market Data Processing in HTS: A Memory Architecture Combining Lock-Free Design and Object Pools
While planning to modernize our in-house HTS program's architecture around Direct2D and multi-core parallel processing, the issue I agonized over the most …
The Hidden Cause Behind 100GB of MacBook System Data: The Complete Fix for External Drive Flutter Build Errors and Storage Bloat
One eternal challenge for app developers using a MacBook is, without fail, "not enough storage." If you're running a 256GB or 512GB model, at some point th…
HTS/MTS Development in Practice: The Complete Guide to Smart Pointers (unique_ptr, shared_ptr) for Zero Memory Leaks
In brokerage HTS/MTS server and client systems that must process a massive stream of orders and market data around the clock, a memory leak is not just a s…
HTS/MTS Development in Practice: Refactoring Legacy C++ Code into Modern C++ to Reveal Intent
In a brokerage's core HTS/MTS trading engine module, where thousands of quote updates and trade notifications flow through every second, performance and st…
Refactoring Legacy C++ Code into Modern C++: Writing Code That Reveals Intent
In a brokerage's HTS (Home Trading System) and MTS server environment, where tens of thousands of trade executions and order records pour in every second, …
The Right Way to Refresh a Screen: The Invalidate() Function and the Dirty Flag Pattern
One of the functions used most often in MFC development is Invalidate(). But are you calling it carelessly every time you just want to redraw the screen? B…
Generating a PPT in 10 Minutes Without Ever Opening PowerPoint (ft. Claude Code, Google Flow, Canva)
What's the biggest waste of time when putting together presentation slides or lecture materials? It's "hunting for a template" and "aligning shapes and mat…
Building My Own Tech Blog with Hugo and Vercel: A Complete Setup Guide and Troubleshooting Report
I've finally launched my personal tech blog, Rico's Tech Blog (ricosheaven.com), to the world! I started out with the combination of Hugo, a lightweight, f…
Fully Solving GDI Leaks and Crashes When Closing Large Numbers of HTS Screens
While migrating the chart module (TeeChart) version in a brokerage HTS (Home Trading System), I ran into one of those bizarre bugs that would make any C++ …
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Crafted with precision.
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Built on Hugo static architecture with zero runtime bloat. Exploring the intersection of modern C++ systems, AI agentic workflows, and thoughtful writing.
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