[tbb-bugs] #23111 [Applications/Tor Browser]: A web page is slowing down your browser.

[Tor Bug Tracker & Wiki]

#23111: A web page is slowing down your browser.
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 Reporter:  cypherpunks               |          Owner:  tbb-team
     Type:  defect                    |         Status:  needs_information
 Priority:  Medium                    |      Milestone:
Component:  Applications/Tor Browser  |        Version:
 Severity:  Normal                    |     Resolution:
 Keywords:  tbb-usability-website     |  Actual Points:
Parent ID:                            |         Points:
 Reviewer:                            |        Sponsor:
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Comment (by cypherpunks):

 Replying to [comment:7 gk]:
 > Replying to [comment:6 cypherpunks]:
 > > Replying to [comment:5 gk]:
 > > > Replying to [comment:4 cypherpunks]:
 > > > > Replying to [comment:3 gk]:
 > > > > > Works for me, as I said, both in Safer and Safest mode. If you
 still see this problem, please reopen the ticket with your OS,
 > > > > Windows
 > > > > > security settings,
 > > > > Safer
 > > > > > additional browser modifications.
 > > > > Unmodified both stable and alpha.
 > > > > > Please, attach a screenshot as well showing the notification bar
 about the slowdown.
 > > > > Standard yellow bar, nothing special.
 > > > >
 > > > > Overloads one core, loading aframe.io...
 > > >
 > > > Do you get the yellow bar as well in standard mode?
 > > No. But it still happily fucks the system when the page is visible.
 (Not 100% CPU, more load on 32-bit version.)
 > > > If not, which of the prefs we set is causing the problem? (The ones
 in question are: "javascript.options.ion",
 "javascript.options.baselinejit", "javascript.options.native_regexp",
 "media.webaudio.enabled", "mathml.disabled", and
 "gfx.font_rendering.opentype_svg.enabled".
 > > It could be only additional load by processing scripts from
 aframe.io...
 > > "media.webaudio.enabled" - seriously?
 >
 > Yes, that's part of the prefs we currently set (see: #21601).
 But it does nothing. How could it be a problem?
 > But that said it would be still helpful if you could tell us which pref
 is causing the problem (be it by additional load or missing
 optimizations).
 On Safer it sucks for about 5 min. On Standard, if you disable
 "javascript.options.ion", it sucks for about 30 sec. Further disabling
 "javascript.options.baselinejit" will give you the same result as on
 Safer. No surprise. But WTF with Standard?

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/23111#comment:8>
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