system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5:Why CPU clock speeds havent seen major increase even tough we made major improvements on nm scale?

It's always around 2.8GHZ to 3.5 GHZ. Why there are no 10GHZ or so? Please explain thank you :)
gpt
You cannot cheat physics. 

Every CPU has a clock that lets it synchronize its internal workings. The higher the clock the more operations can the proccesing unit perform in a unit of time. This value cannot be infinite because of propagation delay, which is time a logic gate needs to "open" and "close". If the clock would be faster than its internal gate limit it wouldnt work because operations would be "cut off" by the clock cycle.
Also higher clock speeds mean higher power draw and problems with internal heat dissipation. 

Intead of going for higher clock speeds, manufacturers go for more cores. Which means that instead of one unit doing everything very fast you have 2,4 or even 12 slower units doing the work together. This is also better when you go to smaller architectures, because instead of having the same core smaller, you just put 4 instead of 1 in the same space.