> It doesn't really matter if trace time is shorter for 3.7, if the total
> time he has to wait is longer.

Elapsed time is the time he has to wait, total time is the amount of 
"work" the CPU has done (the units should technically be CPU-seconds or 
core-seconds or something). It's a bit like the difference between a 
wall needing a total of 10 man-hours to build, but only 1 hour has 
elapsed because you got 10 men to do it.

Once you get more cores the difference becomes even greater, you could 
have an elapsed time of 4 seconds but a total CPU time of 38 seconds. In 
that example the render is complete in 4 seconds, not 38.

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