You probably have hardware acceleration disabled. Open particleIllusion Preferences, then on the OpenGL page make sure “use hardware acceleration” is checked.
If you want to do a side-by-side comparison of 3.0.1a and 3.0.2, and you used the 3.0.2 update, then you can just download the 3.0.1a update from the updates page of our website, unzip it to a temp folder, rename the exe “particleIllusion_301a.exe” or something like that, and move it into your particleIllusion 3 folder. (The 3.0.1a update was just just a zip of the exes.)
This will only work if you used the update to go from 3.0.1a to 3.0.2.
If you do a side-by-side comparison, I expect you to find them both running at the same speed.
Alan.
http://www.wondertouch.com