Tor Browser very slow/unresponsive on linux
I know it is difficult to make quality bug reports about generic performance issues, but I'll try my best.
I'm running Tor Browser 6.5 (firefox 45.7.0) on Debian 8 with 4.8 linux kernel from bpo. The hardware is x86_64 based laptop (3rd gen i7 CPU).
The standard Debian firefox-esr is based on same upstream Firefox version, so it is easy to compare the behavior of the two browsers.
Standard debian firefox is quite fast and responsive, even with large pages containing fairly heavy javascript.
However, Tor Browser is super slow, even with javascript disabled by default, or browsing simple static web pages. I am not referring to loading pages through Tor network (it is obviously always going to be slower), but the GUI itself: scrolling, changing tabs, etc.
The browser process uses very much CPU, even when there are only a few idle tabs open. When scrolling or typing, everything seems to stop every couple of seconds. Setting the security level to "low" seems to help a bit, but it is still way slower than the normal FF build.
Trac:
Username: dujaus