"PerfPowerServicesSignpostReader" eats RAM and CPU

Give this a try: boot into Safe Mode according to How to use safe mode on your Mac and reboot normally and test to see if the problem persists.

NOTE 1: Safe Mode boot can take up to 3 - 5 minutes as it's doing the following; 

• Verifies your startup disk and attempts to repair directory issues, if needed

• Loads only required kernel extensions (prevents 3rd party kernel/extensions from loading)

• Prevents Startup Items and Login Items from opening automatically

• Disables user-installed fonts 

• Deletes font caches, kernel cache, and other system cache files

NOTE 2: if you have a wireless keyboard with rechargeable batteries connect it with its charging cable before booting into Safe Mode. This makes it act as a wired keyboard as will insure a successful boot into Safe Mode.

PerfPowerServicesSignpostReader— background daemon on macOS and iOS that gathers system telemetry and performance data

part of the PerfPowerServices framework. It parses os_signpost data to monitor performance, sometimes causing high CPU or RAM usage during intensive logging tasks

No resolve I try turning off Analytics & Imp and compare your results...(?)