🧠 X.com Heavy JS Optimizer+

Oppai1442
2025-10-22T11:16:28Z

Enhance X.com/Twitter performance by removing heavy CSS, throttling FPS, limiting feed DOM, blocking analytics, and optimizing offscreen videos.

🧠 X.com Heavy JS Optimizer+

⚡ Overview

X.com Heavy JS Optimizer+ is a high-performance userscript that dramatically reduces lag, scroll jank, and CPU load on X.com (Twitter).
It intelligently removes redundant animations, limits repainting, pauses offscreen videos, and caps JavaScript frame rates — all without breaking the core site experience.

🚀 Features

🧹 Lightweight CSS Cleanup
Removes heavy effects (backdrop-filter, blur, gradients) and disables GPU-stressing layers.

⚙️ Passive Event Optimization
Forces passive: true on scroll/touch listeners for smoother rendering.

🎞️ Smart Video Control
• Only one video can play at a time
• Auto-pause when scrolled offscreen
• Prevents auto-play and decoding spam

🧩 DOM Feed Garbage Collector
Keeps only the last N tweets in the DOM to prevent memory bloat.
(Configurable from userscript menu.)

📊 Metrics Blocking (Optional)
Blocks unnecessary telemetry calls like scribe, engagement, and client_event.

⚡ Aggressive Runtime Mode
Auto-detects long tasks and dynamically limits FPS (requestAnimationFrame) to maintain stability.

💤 Tab Visibility Safety
Auto-pauses all videos when tab is hidden.

🧰 Menu Commands

Available via ViolentMonkey / TamperMonkey menu:

🧠 Toggle Aggressive Mode

🧩 Set feed tweet limit

📊 Enable/Disable metrics blocking

🧪 Benchmarks

Scenario | Before | After | Improvement
Scrolling feed 100+ tweets | ~48–55 FPS | 90+ FPS | +85%
Memory footprint (avg) | 1.4 GB | 650 MB | −53%
CPU load (video active) | 45–60% | 25–30% | −50%

(Tested on Brave 1.72 / Win10 / Ryzen 7 5800H)

⚙️ Compatibility

✅ Works on:

x.com

twitter.com

🧩 Supported managers:

ViolentMonkey ✅

TamperMonkey ✅

FireMonkey 🟡 (limited support)

💡 Tips

For best results, disable other performance-altering scripts or extensions.

You can monitor real-time CPU impact via Chrome DevTools > Performance.

🪄 Credits

Developed by Oppai1442
Made with ❤️, caffeine, and a stubborn hatred of lag

If you encounter any issues, please leave feedback — I’ll fix them as soon as possible.

License: MIT
View source on GreasyFork

⚠️ Disclaimer:
This script modifies rendering behavior for optimization purposes.
Use at your own discretion — functionality on experimental browsers may vary.