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After the recent update my firefox is using almost half of my PC's RAM.

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  • Última respuesta de cor-el

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It's never been like this. It has become slow, laggy and unusable

It's never been like this. It has become slow, laggy and unusable
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You could try this please : Go the 3 Bar Menu then Options --> General --> Performance and untick everything. change the recommended size lower then see how it runs. Note: 1 = No Multiprocessor = slow again. Try 2 Restart Firefox after making these changes please.

Note : Acceleration is for your Video Card, monitor to see if need to turn back on. https://support.mozilla.org/en-US/kb/performance-settings

  • Please leave the check mark in Prevent Accessibility Services.

Please let us know if this solved your issue or if need further assistance

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There is nothing against using only one content process versus multiple content processes in case of performance issues. Only if you completely disable multi-process then there isn't a separate content process and a crash in a tab will take down Firefox or the user interface will respond slower.