An instruction added as a curiosity / micro-optimization back in 2010 is now very important.
Previously: "PCID is now a critical performance/security feature on x86" item?id=16094349
Interesting that it's more substantial on older CPU's. The cynic in me wonders if that's a way to force an upgrade from CPU's that normally would be fine for most typical office use.
>>> If you're using a 4th-generation Core or older CPU, however, you'll see "more significant slowdowns,"
With server CPUs always being a few generations behind the desktop, this is gonna have massive impact on datacenters.