[magila]

The OS is doing something screwy if frequency scaling causes noticeable performance regression. A modern Intel CPU like the 9750H supports very low latency (on the order of microseconds) hardware driven frequency scaling which should pretty much always perform better than leaving the CPU locked at the base frequency.

Intel Macbooks are also notoriously thermally limited so I wonder if the settings you're using are just causing the CPU to run hotter than it would at stock.

[hnuser123456]

I have a thin gaming laptop with the same CPU, and stock settings let it climb to 100C and then figure out how fast it can run without getting hotter, usually also with far too much voltage. Decreasing the voltage, and even power limit, and disabling boost, lets you set that temp ceiling to something closer to 60-80C, which will make the CPU more comfortable running at higher frequencies, although with a theoretically slightly reduced stability margin due to less voltage overhead. However, long-term use at high temps and voltage can also degrade stability, so it's a delicate balancing act. The only way to guarantee sustained performance at low temps is to improve cooling, with higher fan speeds or a laptop cooler.