I am a regular user of skype video calls. I have a very fast quad core PC with 4GB of ram. My machine has run perfectly well with skype till now. Now as soon as I start a video call, my PC becomes super slow - even moving my mouse results in the pointer moving in jerky steps across the screen. Looking at task manager I can see that skype is using 33% of the CPU time and system idle process takes 67%.
Confusingly quite a few things have changed on my system recently. My AVG virus scanner has just asked to do a major update and I have installed a new router- a netgear DG834. I am wondering if either of those may be causing trouble.
UPDATE: If I iconise the skype video window then my PC speeds up again.. and slows down again the moment I expand it.
UPDATE II: I should have mentioned that I have four monitors connected to my PC, driven by two dual output graphics cards. I have just found that the slowdown is dependant on which monitor I put the video window in. Everything is fine when skype is in my main monitor, and slow in any of the other three.