Microsoft released the first Patch Tuesday update for Windows 11, which brought a number of fixes to the new operating system. Most notably, it solved compatibility issues between certain Intel “Killer” and “SmartByte” networking software and Windows 11, where users would see connection drops and slow network speeds.
Microsoft may have spent too much time designing Windows 11 for hybrid CPU designs that mix performance and efficiency cores, with Intel’s Alder Lake due out in the coming weeks. This resulted in poor AMD CPU optimization in the release build, which appears to be growing worse with each update. Thankfully, the patches are set to be released in a week.
The company said in the release notes that there weren’t any known issues with this update, but it didn’t take long for someone to find one based on the extensive feedback that can be found on the Feedback Hub and the known issues present in the release build of Windows 11. It turns out that Microsoft managed to make the performance issues recently observed on Ryzen CPUs even worse, just as AMD is readying a fix for one of them.
To put things in context, the release build of Windows 11 slows down AMD CPUs by up to 15 percent in some workloads such as eSports games and single-threaded applications. The folks over at TechPowerUP were curious enough to fire up the AIDA64 Cache & Memory Benchmark and see if anything has improved after this first update. What they found was that the L3 cache latency of the Ryzen 7 2700X CPU, which is around 10-11 ns on Windows 10, had increased to 17 ns on the release build of Windows 11 and currently sits at around 32-34 ns after the first monthly patch.