The latest articles on Forem by Matsuzaki Yosuke (@matsuzaki_yosuke_3f74f648). https://forem.com/matsuzaki_yosuke_3f74f648 https://media2.dev.to/dynamic/image/width=90,height=90,fit=cover,gravity=auto,format=auto/https:%2F%2Fdev-to-uploads.s3.amazonaws.com%2Fuploads%2Fuser%2Fprofile_image%2F3710082%2F57885611-cc24-4258-ac8c-242c889c3cf9.png https://forem.com/matsuzaki_yosuke_3f74f648 en Matsuzaki Yosuke Wed, 14 Jan 2026 03:30:07 +0000 https://forem.com/matsuzaki_yosuke_3f74f648/rust-vs-rsi-how-i-calculated-that-i-lift-500kgday-with-my-fingers-3ana https://forem.com/matsuzaki_yosuke_3f74f648/rust-vs-rsi-how-i-calculated-that-i-lift-500kgday-with-my-fingers-3ana <p>Hello devs!<br> I am a former Series B engineer who developed RSI (Repetitive Strain Injury).</p> <p>To visualize the invisible manual labor of coding, I built a desktop widget using <strong>Rust</strong> and <strong>Tauri v2</strong>.</p> <h2> The Shocking Data </h2> <p>I did the math based on a standard mechanical switch actuation force (80g):</p> <ul> <li> <strong>1 Keystroke</strong> = 80g</li> <li> <strong>1 Day of Coding</strong> = ~500kg (1.7 Grand Pianos) 🎹</li> </ul> <p>I realized I was lifting a car every week with just my fingers. No wonder my wrists hurt.<br> <a href="https://media2.dev.to/dynamic/image/width=800%2Cheight=%2Cfit=scale-down%2Cgravity=auto%2Cformat=auto/https%3A%2F%2Fdev-to-uploads.s3.amazonaws.com%2Fuploads%2Farticles%2F1k5u6qw32rt9viiff88s.png" class="article-body-image-wrapper"><img src="https://media2.dev.to/dynamic/image/width=800%2Cheight=%2Cfit=scale-down%2Cgravity=auto%2Cformat=auto/https%3A%2F%2Fdev-to-uploads.s3.amazonaws.com%2Fuploads%2Farticles%2F1k5u6qw32rt9viiff88s.png" alt=" " width="672" height="504"></a></p> <h2> The Tech Stack: Why Polling over Hooks? </h2> <p>This was the most interesting technical decision.<br> Most key-loggers use OS hooks (like <code>rdev</code>). However, I chose a <strong>low-level polling strategy</strong> (checking key states every 50ms) for this tool.</p> <p><strong>Why?</strong></p> <ol> <li> <strong>Stability:</strong> Hooks can crash the input chain if they bug out. Polling is isolated.</li> <li> <strong>Permission Hell:</strong> macOS requires intrusive "Input Monitoring" permissions for hooks. Polling bypasses some of this friction.</li> <li> <strong>Privacy:</strong> I only needed to know <em>if</em> a key is pressed to calculate the "weight", not <em>which</em> key was pressed.</li> </ol> <p>It’s a tradeoff: I sacrificed nanosecond precision for rock-solid stability.</p> <h2> The Result </h2> <p>I implemented a "Health Bar" system that drains as you type, treating coding energy like HP in a video game.</p> <p><a href="https://media2.dev.to/dynamic/image/width=800%2Cheight=%2Cfit=scale-down%2Cgravity=auto%2Cformat=auto/https%3A%2F%2Fdev-to-uploads.s3.amazonaws.com%2Fuploads%2Farticles%2Ftez1mh78c7fxbeikell6.gif" class="article-body-image-wrapper"><img src="https://media2.dev.to/dynamic/image/width=800%2Cheight=%2Cfit=scale-down%2Cgravity=auto%2Cformat=auto/https%3A%2F%2Fdev-to-uploads.s3.amazonaws.com%2Fuploads%2Farticles%2Ftez1mh78c7fxbeikell6.gif" alt=" " width="320" height="67"></a></p> <p>If you are curious about the implementation or want to see your own "Daily Tonnage", I've put the tool up here.<br> <strong><a href="https://booby.dev" rel="noopener noreferrer">The Burnout Meter (booby.dev)</a></strong></p> <p><strong>(It's free and runs locally, no data is sent to the cloud)</strong></p> <h2> Discussion </h2> <p>Have you ever dealt with RSI? I'd love to hear your thoughts.</p> rust tauri healthydebate programming