[tor-bugs] #26019 [Applications/Tor Browser]: Allow javascript.options.ion, javascript.options.baselinejit, and javascript.options.native_regexp at the highest security level

[Tor Bug Tracker & Wiki]

#26019: Allow javascript.options.ion, javascript.options.baselinejit, and
javascript.options.native_regexp at the highest security level
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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:                            |  Actual Points:
Parent ID:                            |         Points:
 Reviewer:                            |        Sponsor:
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Comment (by cypherpunks_reply):

 On my machine (quad core, 3 Ghz), the lack of Javascript optimizations
 increases extension initialization time greatly.  Normally this blocks the
 browser window from appearing during startup, but you can easily see it
 happening by disabling and enabling an extension in about:addons.

 With the security slider set to standard, uBlock Origin with most of the
 default filters enabled initializes after about 5 seconds of one cpu core
 pegged at 100%.

 With the security slider set to safer, it takes 25 seconds.  During this
 time the browser UI is unresponsive.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/26019#comment:3>
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