Got myself a new display and find myself with ample space to fill my screen with lots and lots of windows (5120x1440).
Before I used the tabs within a single Firefox window and never used more than one tab at a given time just because resolution wasn’t suitable to run multiple browser windows.
When watching a video on YT on e.g. “Firefox 1”, all other tabs on “Firefox 2” slow down really bad. Smooth scrolling gone and a second video resulting in dropped frames and overall worse responsiveness.
I can rule out hardware, because when running two different browsers (Firefox+forked Firefox), everything is fine. I also checked Firefox settings for the performance options and also made sure “dom.ipc.processCount” is set correctly in about:config.
In my KDE desktop I can start applications either in “new window” or “start new instance”, but pstree doesn’t show any difference and didn’t resolve any problems.
Any help? I can use multiple different browsers for each window I want to use as a workaround, but that’s not an elegant solution in the long term.
btw. 6 weeks on Linux now. Love it!