节奏要紧凑点用英语怎么说

Catch up the rhythm!

or

Catch up the beat.

or

Faster.

节奏要紧凑点the pace of the class should be continuous.
(continuous a.连续的,不断的)

If you are using it in class, "be quick" will be better, 'cause it's oral and easy to understand.

Pace it up!