In my experience task-manager _can_ err in the other direction - e.g. a
single-core "hyperthreaded" shows up as two (virtual) cpu's so task-manager
 reports 50% overall usage while in reality the usage is closer to 100%.

As for 3.6 versus 3.7, what are you rendering? Meshes?  At this stage and
for my needs I get about twice the performance from multiple instances of
3.6 compared with running 3.7. Some results I got are here:

http://news.povray.org/povray.general/thread/%3Cweb.45a68007797c8d649356f54f0%40news.povray.org%3E/

Charles

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