Hey there 
The issue you’re describing might well be related to module behaviour. I’d strongly recommend checking to see if the issue persists when you launch the game in safe config, and keeping an eye on the dev tools console (F12) to see if there are any errors being logged when this occurs.
A lot of the processing for rolling, moving characters, etc. happens in the browser. If there is something causing errors or high resource usage in the browser, you might see this kind of behaviour.
It’s also a good idea to confirm your hardware acceleration is active and to check your world size.
Let me know if troubleshooting yields fruit or if you run into any roadblocks!