What's the bottleneck in 7zip (or other compression software)?

Soldato
Joined
26 Apr 2013
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Plymouth
I've recently switched out all of my mechanical hard drives for solid state storage to make a silent rig. As an aside, I thought it might increase my extraction speed. However, I noticed that my extraction speeds are still the same, they max out at 151MB/s.

I'm extracting from one SSD to another (both have DRAM), my CPU is not maxed on any core and there's loads of free RAM.

That would suggest it's not a hardware bottleneck, so what is it?
 
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