I'm having similiar slowness problems. When it is searching the database for a list of fields or tables to show, my cpu is tagged and it acutally slows me down instead of speeding me up. I typically have to wait 2-5 seconds before my cursor will move again. In that time I could have just typed it out. Also I find if I am not looking at the screen and just typing away, prompt may have put up its pop-up, slowed my system down and I chose something from the list instead of doing what I was typing.

Neat idea, but it appears to slow me down more than help.

Thanks Red Gate -  hopefully the next version will get the lead out.