masq, what you're describing seems like it's only you and a couple other people are experiencing that.. but the general mass that owns the N900 (like myself) aren't experiencing anything close to that.. My N900 is really fast.. everything opens as soon as I touch.. Task manager opens as soon as I tap on the screen to switch applications.. I can run multiple applications and still use it with no problems at all..

So the problem here is with your N900, you might have a defect somehow or you might need to flash your firmware.