This is actually based on one of the final windows 10 builds, prior to the switch to windows 11 branding, it has the features of 11, but the 10 start menu and bar.
People citing terms of doing anything tend to be bignoters that know nothing and travel with the flock.
Sorry, but you're claims of reduced performance indicates an issue with your machine and testing under disimilar environment configurations, not an issue with 11 vs 10 itself
I don't think you even realise what a 7 point single thread increase even constitutes, more importantly is the big step up with the multithread score where 100ish points would typically correlate to an extra 200mhz on the core clocks. My 1680v2 is performing as if its running 4.6ghz rather than 4.2 by just upgrading from 10 to 11, though that is a take based on the improvements from the Bulldozer scheduler patch against Nahalem and R11 from back when that happened.