Javascript Performance Thread

[Erunno]

You cannot only work from benchmarks. Benchmarks do not represent real world cases in most cases,

Unfortunately for FIrefox it also doesn't fare well on JavaScript-heavy real world cases. 280slides is noticeably faster on Mulproc and Opera in my experience destroys the competition on Google Maps (though this is probably in part due to their rendering library Vega). Or what about the SNES emulator written in JavaScript? It may not be your typical web application but it painfully shows the limitations of Firefox' current engine. TraceMonkey missed the market requirements in parts. The whole two JavaScript engines approach is also not without its wart like having two different assemblers now.

[Bluefang]

In the Real World™ there's more to performance than just JS. There's page rendering, content re-flowing, DOM mutation, etc... It's not always clear where the performance bottleneck is.

[Erunno]

That's true. The IE developers wrote a great article how individual sites stress different parts of a browser. Anyway, isn't it too early to discuss Firefox 4.0 JS performance as long as JägerMonkey including tracing integration hasn't landed yet? We can still complain if the performance doesn't get noticeably close to the release.

[bogas04]

All is about to land

[Stifu]

Or what about the SNES emulator written in JavaScript?

It's a NES emu, and a Mozilla presentation video has recently been posted showing how Firefox (Minefield) plays it at 60 FPS...

[bogas04]

it is JS-NES , and yeah they did show it playing @ nice frames (mario i guess , he even missed the power up )
But in large, they too got regressions ...

EDIT: its running @ 13~14 here

[Erunno]

showing how Firefox (Minefield) plays it at 60 FPS...

Yes, I know. That's why I said it demonstrates some current limitations of TraceMonkey.

its running @ 13~14 here

Are you running a JägerMonkey-enabled build?

[Erunno]

All is about to land

Latest blog post by one of the JS developers states that landing is planned for September the first.

showing how Firefox (Minefield) plays it at 60 FPS...

Yes, I know. That's why I said it demonstrates some current limitations of TraceMonkey.

its running @ 13~14 here

Are you running a JägerMonkey-enabled build?[/quote]

[bogas04]

nope , was thinking it would run fine after TM landings

Yeah, it is supposed to land by Sept 1 , but after TM improvements , even Fatvals got r+s , so its not too long when we will be seeing bits of JM landing to trunk

[Solidstate89]

EDIT: its running @ 13~14 here

I usually get around 20FPS with the box zoomed in. Around 25 zoomed out.

[Harsh86]

Or what about the SNES emulator written in JavaScript?

It's a NES emu, and a Mozilla presentation video has recently been posted showing how Firefox (Minefield) plays it at 60 FPS...

Is there a link to this video?

[Stifu]

Is there a link to this video?

Sorry, I can't find it back. Others saw it too, so they may know.

[watervole02]

Or what about the SNES emulator written in JavaScript?

It's a NES emu, and a Mozilla presentation video has recently been posted showing how Firefox (Minefield) plays it at 60 FPS...

Is there a link to this video?

I think it's this one. The NES part is at 2:40.

http://www.youtube.com/watch?v=GnYs2Q2pg1M

[bogas04]

Are you running a JägerMonkey-enabled build?

Can't find it @ http://ftp.mozilla.org/pub/mozilla.org/ ... key-linux/

[smoohta]

Well... in the video you posted you can see dmandelin's directory: http://people.mozilla.org/~dmandelin/Summit2010/ from which he opened the ants benchmark.
If you snoop in it, you can see there's a browsers folder with moo1.zip (supposedly the win32 JM moo build he was using in the presentation) and a "regular" firefox-3.7a5pre.en-US.win32.zip...
There's also an ants folder containing the cool ants benchmark

I've tried the moo build with the ants benchmark and it seems to work just like in the presentation, though I couldn't get JSNES to load due to some javascript errors...