AMD announced last week that the performance of its processors running the new Windows 11 operating system was lower than expected. Although it was introduced as a stable version, Microsoft's new OS doesn't take full advantage of AMD's processors and causes delays in their performance. Interestingly, Windows 10 didn't see anything like that. But the recently released first cumulative update for Windows 11 has further exacerbated the problem.
The first issue has to do with a threefold increase in latency when accessing the L3 cache, which in some games reduces performance by up to 15%. The second issue is related to the malfunction of the UEFI CPPC2 technology, which is supposed to distribute relevant processes to the fastest processor cores for maximum performance.
TechPowerUp experts measured L3 cache access latency of Ryzen 7 2700X processor. It turned out that in the first stable version of Windows 11 the latency was 17 nanoseconds, after installing the cumulative update on October 12 the latency increased to 31.9 nanoseconds. By comparison, in Windows 10, that delay is only 10 nanoseconds.
Microsoft has promised to fix the problem by the end of this month, and AMD, for its part, said it will introduce a new driver for its processors next week.