---Since the release of Runescape 3, there have been many reports regarding a significant drop in frames per second. This is caused by your audio being enabled in-game. If you'd like to maintain a high frame-rate, please MUTE your audio while Jagex works on fixing this issue (simply by ticking 'Global Mute').---
Gathered the above info in the tech forums and decided to give it a try and it did in fact increase the frame rate for me. not as laggy as I once was, hopefully this can work for others with a prob. =)
26-Jul-2013 09:12:51