Opened 2 years ago

Last modified 2 years ago

#21388 needs_information defect

Tor Browser very slow/unresponsive on linux

Reported by: dujaus Owned by: tbb-team
Priority: Medium Milestone:
Component: Applications/Tor Browser Version:
Severity: Normal Keywords:
Cc: Actual Points:
Parent ID: Points:
Reviewer: Sponsor:

Description

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.

Child Tickets

Change History (1)

comment:1 Changed 2 years ago by gk

Status: newneeds_information

There are two things that would help debugging this:

1) Is that new in Tor Browser 6.5 for you? If not which is the first version with this behavior? You can find older versions for testing here: https://archive.torproject.org/tor-package-archive/torbrowser/

2) There is #19276. Could you play with the preferences mentioned there and report back if flipping any of them changes things for you?

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