First of all - thanks for your reply. The lag spikes appears rhythmically every minute or so. These are the specs for my new PC: My laptop is a MacBook Pro. I've tried using the wired connection on my laptop with no problems. I live with two of my friends, which play RS as well, and they don't experience any problems either. These are my speed- and pingtest results: I notice that i has trouble measuring my packet loss. I ran the test several times with same result - maybe this could be the issue? btw: i've got Java (Version 7 Update 4) installed.