"liu" wrote in message
Tests of this sort have been done.
So is it available somewhere online so to save my time?
I can’t find it but there was a Photoshop"speed test" posted to the forums on www.dpreview.com a long time ago where, IIRC, in just a few steps you created a new very large file in PS with a checkerboard pattern and then applied the blur. I think it took one minute to build the file and about two minutes to apply the filter on a so computer.
This was either in their PC forum or Retouching forum. If you ask there you should get a good answer.