bug:Lag only while playing super fast chess (10 sec-30 sec)

I am in an ultra bullet touney and my connection is very fast. All searches are loading in a flash but still when the tourney is just about to start and my game has started I start experiencing lag, no matter how good my connection is. As a result i lose about 15-20 seconds of my time which ensures i lose every game. Is it a problem with chess.com?

ultra bullet chess = 10 sec to 30 sec time controls

Hi. Is this happening only when you are using Beta? 

i might have one it looked like i moved e4 yet i lost on time 

I didn't check that. I will inform u the results of what happens if I leave beta

Thank you! 

It does not lag without beta!

it does with beta