Jerking and Scrolling in Gmail (Firefox 3B2).

When I open a thread of messages in Gmail that contains several messages, say more than 2) the screen scrolls up and down in multiple quick jerks which can be very disconcerting. 

With long threads, its almost unusable until the entire thread loads and each sig is validated.

Simply disabling the FireGPG 0.7.4 Add-on eliminates this behavior. 

There should be some method of delayed validation of signatures when a long thread of messages is opened, or validation in the background, without delaying or repainting the interface.