It's a known issue, been around since retina MBP was introduced; see:

https://code.google.com/p/chromium/issues/detail?id=136555

For me, I have no problems with Chrome when running an rMBP with a external display, but once I switch to the built in retina display, performance suffers significantly.

I switched to Safari a few months ago despite preferring Chrome because I couldn't stand Chrome's poor retina performance.