How to stop throttling

Try using an application called Mac Fan Control , its very helpful. The site is https://www.crystalidea.com/macs-fan-control.

Max out Fans and test performance.

Have a nice day.

Your ambient temperature is too high. 34 C / 95 F is the problem.

1. Remove any cases, elevate the mac, open the clam shell and get a blower if your room temperature isn’t that hot.
2. Place the Mac in a room cooled. For testing - try to get it to 15 C / 60 F and repeat your measured benchmark or measured load.
3. Consider a trusted companion to examine the heat sinks and renew the thermal paste after cleaning and inspecting the internals. If you are not sure the technician is capable, skip this - everything in your sensors look normal for thermal throttling except I would expect the kernel task to be soaking all the CPU so you see no idle.