Flash Player 30 huge performance regression due to TimerJitterMicroseconds (Spectre / Meltdown Mitigations)

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Flash Player 30 huge performance regression due to TimerJitterMicroseconds (Spectre / Meltdown Mitigations)

Félix GERZAGUET
Hello,

I want to report a pretty bad performance regression that just hit my
application after upgrading to FP30.

Previously the app took around 4 seconds to start-up, now it is more than
40 !

I spent some times tracking the issue down and finally I found that as per
[1] if I set-up TimerJitterMicroseconds=0 than the performance are the same
as before.

I guess my app is falling into the "limited circumstances" case.

I think the massive slowdown is probably because Flex rely massively on
Timers.

Does anybody have a way to alleviate the issue (without messing with the
mms.cfg file) ?

[1] http://blogs.adobe.com/flashplayer/2018/06

Félix