Does clearing browser cache help with ChatGPT performance?

Clearing cache can help with page load speed but not with the DOM rendering overhead that causes lag in long threads. The rendering issue grows during a session as new messages accumulate, so a cache clear before opening the tab does not prevent it.

Does the number of images or code blocks in a thread affect performance?

Yes. Large image outputs and long code blocks add more rendering work per message. Speed Booster handles this because it swaps those heavy messages out of the DOM when they are off-screen, restoring them only when you scroll near them.

Will disabling other extensions help?

Possibly. Other extensions that modify the ChatGPT page can add their own rendering overhead. If Speed Booster does not fully resolve performance issues, try disabling other active extensions to isolate the cause.

ChatGPT performance fix

ChatGPT performance drops in long sessions - fix

Updated May 27, 2026

Quick answer

ChatGPT performance drops in long sessions because the browser accumulates more rendered content as the conversation grows. Each new message adds more to the DOM, and operations like scrolling, typing, and tab switching all become slower as that list extends. Closing other tabs or restarting the browser frees up some headroom, but the same thread will slow down again. Speed Booster keeps performance constant by only rendering the messages near your viewport and swapping the rest in as you scroll.

The performance drop in ChatGPT is gradual and easy to miss at first. The conversation that felt fast at message 10 feels slower at message 60, and noticeably slow at message 100. This is not a ChatGPT account or model issue. It is a browser DOM size issue. Speed Booster applies the standard fix: windowed rendering.

1

Install GPT Master to get Speed Booster

Install the extension and Speed Booster is on by default on the free tier. Reopen any conversation where you have noticed performance degradation.
2

Test the same interactions that were slow

Scroll through the thread, type in the composer, and switch to other tabs and back. All three of these operations are improved by reducing the DOM size, which is what Speed Booster does.
3

Upgrade to Turbo mode if the thread is very long

Upgrade to GPT Master Pro for Turbo mode on threads where Standard has limits, typically several hundred messages or more. Standard covers everyday use at no cost.

GPT Master

Keep ChatGPT performance constant from message 10 to message 500.

Add to Chrome · Free

Frequently asked questions

Does clearing browser cache help with ChatGPT performance?: Clearing cache can help with page load speed but not with the DOM rendering overhead that causes lag in long threads. The rendering issue grows during a session as new messages accumulate, so a cache clear before opening the tab does not prevent it.
Does the number of images or code blocks in a thread affect performance?: Yes. Large image outputs and long code blocks add more rendering work per message. Speed Booster handles this because it swaps those heavy messages out of the DOM when they are off-screen, restoring them only when you scroll near them.
Will disabling other extensions help?: Possibly. Other extensions that modify the ChatGPT page can add their own rendering overhead. If Speed Booster does not fully resolve performance issues, try disabling other active extensions to isolate the cause.

Related guides

Ready to fix this for good?

Keep ChatGPT performance constant from message 10 to message 500.

Add to Chrome · Free

ChatGPT performance drops in long sessions - fix

Install GPT Master to get Speed Booster

Test the same interactions that were slow

Upgrade to Turbo mode if the thread is very long

Frequently asked questions

Related guides

Make ChatGPT work the way you actually use it.