I'm pretty sure the developers are continuously working on making AG better, which includes lowering the amount of lag.
But.
There can be many causes of lag.
Stress on the server (lots of users online).
You have a slow connection.
Your browser or computer is working too hard (too many tabs open, too many programs running),
And I'm pretty sure there's more possible reasons, but those are to my knowledge the most common.
Thread locked because of nonconstructive OP.