Draggable speed issues

Draggable speed issues


Hi everyone.
I'm developing intranet system with some hard drag&drop functionality.
I have from 2-4 draggables (10-15+ is normal) and droppable table with
at least 42 droppable TD's.
I'm facing some strange performance issues:
When I start to drag a draggable it is drawing after a significant
delay of 2-3 seconds. Start callback is also called with this
significant delay. After 10-15 drag&drop's it gets worse up to 5-6
seconds.
I followed some advices found here like destroying draggables after
they aren't needed. That doesn't helped and problem is showing right
after the page is loaded with first drag.
I use jQuery 1.2.6 and jQuery UI 1.5. Problem is showing under FireFox
2.0.0.14 & IE7, under Opera it works fast as should be working