I know very well there are difference between CPUs architectures, but in my opinion they are not what make the big difference here. The 6600k at stock has max boost at 3.9Ghz, the 1700x 3.8Ghz for example, and they have a gap of over 30fps at 720p with the biggest difference in cores count.
Interpret the data however you want, but unless there are data showing the all the CPUs running at the same clock, same amount of cores, arguing about how the difference in architectures and other specs affect the performance is futile.
The game is heavily single threaded and doesn't seem to scale very well with more threads even on a 8-core it just uses 1 core fully and the rest just a bit, it never really goes above 40-50% combined (which is a bit strange in this day and age) but it seems to love a high clock rate/ipc so overclocking definitely helps a fair bit.This is also why it performs worse on HT CPUs since it likes to use a HT core for it's heavy main thread.
I tested this myself and everyone can see it for them self in the taskmanager so just look for yourself if you don't believe me.
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