Fwiw, new test runs, this time with a test project from the DAWBench site.
http://www.dawbench.com/benchmarks.htm
I used the Dawbench-DSP-R5-RXC-EXT project, had my RME HDSP 9632 at 44.1 kHz and the smallest sample block 32. Then I activated FX instances up to a point where dropouts started to happen at playback, which was 200 instances (and 120 bypassed). Like earlier, no anticipative FX processing.
Intel i7 4770k @ 3.5GHz
Windows 10 Home (1607) 64-bit
ASIO Hammerfall DSP, 32 samples, 44.1kHz
Tracks: 5 audio tracks, all files 44.1 kHz WAV, 40 FX tracks with 320 instances of ReaComp (200 active, 120 bypassed). No anticipative FX processing.
Other notes: All pics taken after 1 minute of playback.
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Just for fun, the same test project run in v5.71pre13 with the same settings, except the anticipative FX processing set ON. I could've gone even higher, but stopped at 1800 active FX instances.