It's a Genius K640, it happens only in Opera and only on Youtube. I used Firefox before but I had problems with it. I changed to Opera yesterday and the speed difference is huge. And it's more stable. So changing to Opera is a huge improvement in every area, except this irritating issue. I'm not sure it can only happen on Youtube, but I didn't experience issues like this on other sites yet.

And yeah, I fired up my Firefox again just to check this out, there is no lag there. Just the browser feels slow in overall compared to Opera.

Hi!

I experience a serious lag on Youtube while commenting. The lag is only keyboard input lag, the video plays without any problems. My typing has almost a second delay. Not only typing, but even if I scroll YT with keyboard.
I was curious about using screen keyboard feature of Windows. Not delays at all! If I type with that mouse keyboard software, it works perfectly.

Tried to disable all extensions, disable HW acceleration (just made other things worse and didn't help on keyboard input delay.)

I tried many things, nothing helped and I am clueless about the solution.

My computer:

-Intel G860 CPU @ 3GHz
-2x4 GB RAM
-1TB Western Digital purple HDD
-Asus nVidia GTX 750 OC
-Windows 7 x64