I have rather good results using throttlestop (for my laptop).
This are the settings I use. A buffer size of 64 samples at 48 KHz. is in my setup possible. Without throttlestop it was at least 192 samples.
The biggest drawback is that the fans are quite active, but in a performance setting (in my case in a house of worship) it probably isn’t audible. The beamer is louder anyway.
But keep an eye on the cpu temperature. Fooling around with undervolting is a risk. I didn’t need that anyway.