First, turn off hardware acceleration at bottom of main settings page (open chrome://settings/, click Show advanced at bottom, scroll to the end, un-check Use hardware acceleration when available). You may test for slowdowns immediately, but if that didn't help, open chrome://flags and set up following:
Disable accelerated 2D canvas – Enable
Enable one-copy rasteriser - Disabled
Enable zero-copy rasteriser - Disable
Disable hardware-accelerated video decode – Enable
then click Relaunch now at bottom of the window. If everything will become fine (but a little slower overall maybe), you can switch options back to default one by one until you find one causing the trouble. (if you won't find an option in flags list, skip it. Maybe also look for other options about GPU and hardware acceleration and make sure HW acceleration and GPU usage are disabled. Chrome gets updates quite often, and flags get added and removed in almost each version).
