...About 58000 objects, pretty stable. But without a reference I don't know if this is close enough to the WebGL test to make it an evidence?
This is VERY interesting! Compare my results: ~14k with WebGL, and ~85k with Construct Classic. That makes WebGL only about 16% as fast as native. It may be that the browser security check on WebGL buffers causes that much performance difference. However... according to your results, you get ~45k in WebGL and ~58k objects in Classic. That means on your computer WebGL is about 77% as fast as native - almost as fast as native!
Can I confirm you're using Chrome here, or Firefox?
Dang, I'm gonna have to buy a new graphics card to check that out more.
Armitage1982 - according to tulamide's evidence, it's possible for HTML5 to come close to native rendering speeds. I think sometimes a slow computer is just slow... or maybe it's falling back to software rendering for some reason? Have you tried updating your drivers?