Recently A lot of friends have been complaining on google chromes lag as it updated due to not being able to disable PepperFlash. Google no longer supports Java.
To fix that: In your address bar for chrome type in chrome://flags/#enable-npapi
Click on Enable for Enable npaipi.
Relaunch Google Chrome and go to your usual Chrome://plugins
You can now disable PepperFlash again and not lag again.
This is only a temporary fix until Google Chrome ruins it in a few months.
Still I would advise FireFox, but a lot of DO players like their Chrome for some reason.