https://connect.mozilla.org/t5/discussions/firefox-suddenly-un-usably-laggy-142-143/m-p/105484#M40804 <P>OS: Windows 11 24H2<BR />AMD Ryzen 7 7800X3D 8-Core Processor (4.20 GHz)<BR />64,0 GB RAM<BR />RTX 3090&nbsp;<BR /><BR />No Extension installed (removed all)<BR />Used "Refresh Firefox"<BR />Uninstall and re-installed firefox<BR />Switched to developer edition<BR />Only a single tab is just as slow as having 100 tabs open<BR />Firefox Task Manager shows "Firefox" CPU usage jump between 10 an 90 percent even with only one tab opened.<BR /><BR />I have no problems with other applications or browsers whatsoever.<BR /><BR /></P> Mon, 15 Sep 2025 19:27:41 GMT pixartist 2025-09-15T19:27:41Z https://connect.mozilla.org/t5/discussions/firefox-suddenly-un-usably-laggy-142-143/m-p/105484#M40804 <P>OS: Windows 11 24H2<BR />AMD Ryzen 7 7800X3D 8-Core Processor (4.20 GHz)<BR />64,0 GB RAM<BR />RTX 3090&nbsp;<BR /><BR />No Extension installed (removed all)<BR />Used "Refresh Firefox"<BR />Uninstall and re-installed firefox<BR />Switched to developer edition<BR />Only a single tab is just as slow as having 100 tabs open<BR />Firefox Task Manager shows "Firefox" CPU usage jump between 10 an 90 percent even with only one tab opened.<BR /><BR />I have no problems with other applications or browsers whatsoever.<BR /><BR /></P> Mon, 15 Sep 2025 19:27:41 GMT https://connect.mozilla.org/t5/discussions/firefox-suddenly-un-usably-laggy-142-143/m-p/105484#M40804 pixartist 2025-09-15T19:27:41Z