anton - you may well have something else going on in your system.. it might help your computer a lot overall to make a list of all the things you're generally running, being sure not to forget ie add-ons, and send it to
[email protected]
the classic way to find the -real- cause of something like what you experienced is to set everything to not load on boot, then quit out of anything that doesn't cover in your systray. then add wb, then add dx. see where you start lagging by keeping track of your sysmeter.
if it still looks like wb or if it looks like dx, then make sure you've got fresh dl's of them and weren't running them when you installed. also, with dx, make sure you don't have any old incompatible plugins running around