Rebenchmarked my system with Renoise 3.4 using the rebench_x256.xrns.
i7 4770, macos 10.14.6 at 44.1khz, 8ms, 4 core (8 virtual), 4k->4.5k resolution upscaling(heavy cpu load), 90% overload protection setting:
Renoise 3.4: 248 RPTS (it started to crackle around 190)
Renoise 3.3: 153 RPTS (crackling started around 140)
Renoise 3.1 with 1080p monitor, 10ms, osx 10.9.4: 207 RPTS