Comment #18 on issue 2935 by [email protected]: Poor performance in
Ember app Discourse
https://code.google.com/p/v8/issues/detail?id=2935
fwiw Safari 7.1 on my macbook seems to be twice as fast on the Complex List
too. So there is something definitely going south here.
If you look at the cpu profile it will be all full of yellow exclamation
marks "optimized too many times", which is a bad sign.
I took a quick look a deopts at it seems that optimizations really never
stabilize - I might be wrong but it seems like we are hitting the same
issue I already reported for angular: first several times function deopts
due to polymorphism as we inline more and more alternatives, then it
stabilizes - but at this point GC comes, collects maps and optimized code
and type feedback are thrown away due to "weak-code" dependency and the
loop starts from scratch.
These functions that don't stabilize are relatively big (400 smth blocks)
so not being able to stabilize optimizations for it is a bad sign and an
obvious potential performance drain.
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