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Diminishing performance (increasing lag) the longer Firefox 133 is open

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I believe this problem began in 133. I've noticed that if FF is open for a few hours, it starts to develop a very noticeable input lag. For example, if I'm watching a YouTube video and hit an arrow key to advance the video, there will be a couple of seconds before the browser registers the key press. It behaves like a high CPU issue but I do not detect high CPU usage when this is happening. Restarting the browser resolves the issue for a few hours.

This is happening on Windows 11 as well as on a Mac running Sonoma.

I believe this problem began in 133. I've noticed that if FF is open for a few hours, it starts to develop a very noticeable input lag. For example, if I'm watching a YouTube video and hit an arrow key to advance the video, there will be a couple of seconds before the browser registers the key press. It behaves like a high CPU issue but I do not detect high CPU usage when this is happening. Restarting the browser resolves the issue for a few hours. This is happening on Windows 11 as well as on a Mac running Sonoma.

Alle Antworten (5)

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Hilfreich?

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I haven't tried that yet. It usually takes a few hours before the problem appears and it's intermittent. It might take a while to see if it appears in Troubleshoot Mode.

Hilfreich?

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Also, I'm not sure this is related, but after some time I also notice that it starts to become difficult to click on URL links. As with the other issue, restarting the browser clears it up. I believe both of these issues began in v133.

Hilfreich?

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If Windows Pro version, try testing in Windows Sandbox (VM) to see if you have the same issue. https://www.howtogeek.com/399290/how-to-use-windows-10s-new-sandbox-to-safely-test-apps/ You can also boot windows to safe mode with networking to test.

Hilfreich?

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Hi John, I've seen several threads over on Reddit about YouTube issues in Firefox 133. It may be related to higher-than-HD video (like 1440p), but because the slowdown comes on gradually, it is very difficult to backtrack what may have caused the problem. One user noted that opening videos in a new tab (you can right-click (Ctrl+click) > Open Link in New Tab, or Command+click the link) improved performance, especially if you closed the source tab.

Hilfreich?

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