Testers had noticed that the Zen 4 CPUs, on the new Windows 11 22H2 feature update where slower than an asthmatic ant with a heavy load of shopping and were making their comments clear on the usual social moaning sites.

However, AMD says it tested against those claims and found nothing substantial as the performance across Windows 11 and Windows 10 was pretty much within the typical margins of error. It didn't say what it tested the chips on, we assume it was not a banjo. 

AMD said that it was aware of "unexpected performance deltas in certain games with AMD Ryzen desktop processors as well as performance variances between Windows 11 and Windows 10 in certain game titles."

It said that while it was investigating, its testing so far had not found a material difference in game performance between OS versions across a variety of operating scenarios and game titles. 

It thinks that the differences noted may have to do with the games' optimisations themselves rather than an AMD stuff up. Some users have noted that disabling SMT helped.  

AMD seems to be saying that future optimisations for Ryzen 7000 and the Zen 4 architecture will likely iron out any performance issues.