Youtube (Flash) lag when using high-resolution (1680*1050)

Hey.

Problem: Youtube and other flash videos lag really bad when in fullscreen.

Videos play without lag when they are not in fullscreen.

It only happens when I use high resolution on the display, like 1680x1050 or 1920 x 1200. It never happen when I use lower resolutions.

The "lag" can be described as "flashing".. or frames jump.. It makes the videos unable to watch.. So I either have to watch it in "embedded"/small screen mode or change resolution back to the normal setting.

I think it's a software problem?

Anyone else have the same problem?

Specs:

• Macbook pro retina 2.3Ghz, 8gb ram
• Latest system updates.
• Google Chrome