So, you're actively doing GPS, while browsing the internet, AND taking pictures, and are surprised that it's laggy and stuttering? Most laptops (or desktop PCs) would have problems doing all that at once! That's expecting an awful lot out of a pocket-sized device, no?

If you're just playing audio, it does well. If you want to browse the web, while GPS navigating, and listening to MP3s, and taking a picture, then go get a... wait.. nothing else can do all that at once either. Go buy a GPS, a digital camera and a cheep mp3 player, then use the N900 to browse. It'll all be much happier that way.