https://dl.dropboxusercontent.com/u/80664946/gwt.tar.bz2 has 4 GWT-compiled benchmarks (run "benchmark.html" in each directory, and see results in the web console). Firefox (nightly) does far worse than chrome (dev), by more than an order of magnitude in most of them, firefox chrome binary trees 11.96 0.57 seconds linpack 56.03 1.06 meteor 1.82 0.26 nbody 63.78 6.72 And even on the best one there is a 7x slowdown.

That is indeed bad! I created a shell version for the worst of the four. (Haven't look into the reason yet)

linpack: - interp: 27s - baseline: 8s - ion: 50s That definitely looks like a fault in IM. Quick check shows that we are losing a lot of time in GetElementIC::update. Looks like most caches are disabled. So we are missing an IC for something...

To be exact we are missing a Native[Int32] getelem

After bug 870814, what is the perf here?

(In reply to Luke Wagner [:luke] from comment #4) > After bug 870814, what is the perf here? No need to remeasure. Still way too slow ;). (At best this patch improves the scores with 30%). I don't know how much is related to the fact we use a ic cache instead of specific slotloads. But I think that will bring another improvement. That's on my todo list ;)

(In reply to Hannes Verschore [:h4writer] from comment #5) > I don't know how much is related to the fact we use a > ic cache instead of specific slotloads. Jan suggested to look to baseline caches to decide when to use slotloads. This didn't yield an improvement. Maybe

(In reply to Hannes Verschore [:h4writer] from comment #6) > Jan suggested to look to baseline caches to decide when to use slotloads. > This didn't yield an improvement. Maybe Scratch that comment. This does increase performance. That's the reason I added that depending bug ;). Getting close to v8 performance now !!

nightly binary trees 14.7 linpack 3.22 meteor 0.512 nbody 4.093 So Binary trees hasn't improved. linpack/meteor improved substantially. And nbody is now faster than chrome.

I just tested this: binary trees fx - 7.878s ch - 0.936s linpack fx - 2.21s ch - 40.65s [??] meteor fx - 0.674s ch - 0.393s nbody fx - 2.562s ch - 3.029s