>If taking a look at the geometric mean across the dozens of benchmarks carried out, both the Core i5 8400 and i5 9400F basically have around 18% lower performance from these default/out-of-the-box mitigations on Linux systems for Meltdown, Spectre, L1TF/Foreshadow, and MDS/Zombieload. >18% lower performance >18%
Thats probably around Ivy Bridge / Haswell tier performance. In 2019. Intel BTFO.