Testing performed by Phoronix on some AMD and Intel CPUs has revealed that Intel CPUs suffer as much as a 35% performance drop due to the Spectre-v2 mitigation on Linux, whereas almost all AMD processors post a drop of less than 10%.
https://www.notebookcheck.net/Spectre-v2-mitigation-wreaks-havoc-on-the-performance-of-some-Intel-CPUs-as-AMD-chips-come-out-largely-unscathed.607925.0.html