Fix ChatGPT lag in long conversations
Long ChatGPT threads get heavy and slow. Speed Booster keeps them fast with lazy loading, code block collapsing, search, export, and more. Every feature is free.
The Problem
ChatGPT wasn't built for long conversations
As threads grow, performance degrades. These are real user pains.
Freezing in large chats
The interface locks up when conversations hit 50+ messages.
Sluggish scrolling
Scrolling through long threads becomes painfully slow.
Laggy typing
Input delay makes writing responses frustrating.
Heavy code blocks
Syntax-highlighted code blocks consume significant resources.
Excessive DOM rendering
Every message stays rendered, even ones far off-screen.
No search in chat
Finding specific text in a long conversation is impossible.
How It Works
Intelligent optimization, not a hack
Lazy load history
Off-screen messages are virtualized and restored on demand as you scroll.
Collapse code blocks
Large code blocks are collapsed with expand/collapse toggles.
Reduce DOM weight
Performance mode strips non-essential animations and effects.
Search & export
Find text, export chats, and navigate with conversation map.
Features
Everything included. No paywalls.
Every feature is free for every user. No upgrades, no locks, no limits.
Lazy Load History
Off-screen messages are virtualized and loaded on demand.
Collapse Code Blocks
Long code blocks auto-collapse with configurable threshold.
Performance Mode
Strips animations, reduces DOM weight, maximizes speed.
Fast Scroll
Optimized scroll handling eliminates jitter.
Density Modes
Default, Compact, or Ultra-Compact layouts.
Search in Conversation
Find any text with highlighted results and keyboard nav.
Conversation Map
Auto-detected sections for quick navigation.
Export Conversations
Download as Markdown, Plain Text, or PDF.
Optimization Profiles
Balanced, Max Speed, Reading, and Dev presets.
Advanced Settings
DOM limits, observer timing, scroll debounce.
100% Private
All processing local. No data leaves your browser.
Trust
Built for privacy. Built to be lightweight.
We don't read your chats. We don't track your usage. We don't sell your data.
All optimization runs locally
No chat content leaves your browser
No analytics or tracking SDKs
No accounts or logins required
Manifest V3 compliant
Lightweight under 200KB
FAQ
Common questions
Is this really free?
Yes. Every feature is free for every user. There are no premium plans, no paywalls, and no locked features.
Does this upload or read my chat content?
No. All optimization runs locally in your browser. The extension never sends your chat content anywhere.
How can I support the project?
If you find the extension useful, you can leave a tip on Ko-fi. It helps cover development time and keeps updates coming.
What permissions does it need?
Storage (to save settings), activeTab and tabs (to detect ChatGPT pages and sync settings), and host access to chatgpt.com and chat.openai.com only.
Will it break ChatGPT?
No. The extension only modifies how the page renders visually. It never alters your messages, API calls, or chat history.
Can I disable notifications?
Yes. You can completely disable all extension notifications from the Tools tab.
Enjoying Speed Booster?
This extension is built and maintained by a solo developer. Every feature is free because I believe useful tools should be accessible to everyone. If it saves you time, a small tip goes a long way.
Leave a tip on Ko-fiCompletely optional. No guilt. No pressure.