I experienced factory throttling on my Thinkpad as well, its a T470p (intel) and I was able to reduce temperature by ~7-10 degrees by undervolting the cpu a tee

I experienced factory throttling on my Thinkpad as well, its a T470p (intel) and I was able to reduce temperature by ~7-10 degrees by undervolting the cpu a teensy bit (and cpu cache as well I think). People recommended re-applying thermal paste but I got enough gains out of undervolting.