> Our performance evaluation shows up to 2.7% overhead for the microcode mitigation on Alder Lake. We have also evaluated several potential alternative mitigation strategies in software with overheads between 1.6% (Coffee Lake Refresh) and 8.3% (Rocket lake)
Thanks, missed that! I remember seeing benchmarks showing like 15% slowdown from Spectre/Meltdown mitigations, so this is not as bad as that, but that is on top of the other too I guess...
https://comsec.ethz.ch/research/microarch/branch-privilege-i...