When I have the homepage of www.speedtest.net open in the browser (Firefox 22.0) I see in the taskmanager that the flashplayer plugin (11.8 r800) is using between 20% and up to 70% of CPU and cycling constantly between these values.
I use Windows 8 Professional 32 bit on a single core dual threaded Pentium IV at 3GHz with 2GB RAM and a nvidia GT610 with 1GB and a Samsung 128GB SSD.
What could be the reason for this?