Games laggy in Chrome
The really first thing you should do is delete the entire history in Chrome. Sometimes this leads to strange behaviors.

The second address would be: 

    chrome://flags



Override software rendering list
GPU rasterization
Number of raster threads
V8 caching mode.


If you are already using Developer Options - Force GPU rendering, it might help to use an older Chrome version (I was forced to do this because the latest version always crashes).If all this does not bring anything, I recommend you to switch to another browser like (Puffin etc.), which offload certain things, but i think you know this already.