I put this in the kopitiam section even though I mentioned Photoshop, because it has more to do with hardware than Photoshop.
In Photoshop, make a new RGB white bg 8x10 300ppi document. Open Add Noise and set to Uniform, Monochromatic, 400% and click OK. Then open Radial Blur, set to Amount 100, Method Zoom, Quality Best but do not hit OK yet.
As you hit OK, start timing. Continue timing until the filter finishes, then stop.
Report the time back here along with your machine specs.
my laptop did 3mins and 17 secs. 1.73Ghz Centrino.
I'll go confirm the timings of my main workstation.. too good to be thru.