Saido, I have 1 graphic card and I took the correct blizzard browser.
I had already tried it but I tried it again just in case.
Had the exact same problem with google chrome reverting to software rendering on WebGL.
Took it 2 secs o fix it.
It is based on CEF.
And reverting to software rendering is a known problem of CEF.
WC1 WC2 D1 D2 D3 SC1 SC2 BnetApp work.
May it be possible that they screwed it up simply not knowing how to launch it?
did more testing, the lag starts whenever there is a text that needs to be rendered, even when it fades away. For the rest it seems slow but not spiky.
is the transparency and the overlapping of different frames that cause the lagging.
Tried the windowed mode and the windowed full screen.
Even at minimum window size there is a short lag every time an overlay or fade needs to be displayed.