I usually let this slider sit on its standard value (2) and asked myself what the benefit could be if I pushed the slider to its maximum position. This is what I found on my 4 core iMac 13,2 (27in, late 2012)
- All cores are used to the max whatever the setting is, some gaps (not 100%) exist if set to 1
- Processing times are almost identical when the slider is set to 2 and above
- Processing times are only reduced by 1/3 with the slider set at 2 vs set at 1
It looks like DPL will use whatever resources are available, no matter what your settings are. Pushing the slider further than 3 did not shorten processing at all in my tests. I suppose (have not tested it so far) that higher positions make DPL interfere (annoy) more when I’d do other things in parallel…
Any experience with this out there?