Updated performance notes to add a comment regarding performance loss likely due to Windows 11 updates

Author: colgreen

notes/performance.md

@@ -3,3 +3,4 @@
 * Ensure server GC is enabled.
 * Bear in mind the later versions of dotnet core use tiered compilation, and this is enabled by default from dotnet core 3.0 onwards (see https://docs.microsoft.com/en-us/dotnet/core/run-time-config/compilation)
 * Consider spectre/meltdown mitigations. This will hopefully be increasingly irrelevant over time; the initial mitigations had significant impact on some specific subroutines (but not sure about the overall effect on SharpNEAT).
+* I noticed a significant performance drop on the v4.1 code base between its release in December 2023, and Jan 2025. I think this must be caused by Windows 11 updates as I eliminated dotnet9 as a possible cause; as such I think it would make sense to run efficacy sampling runs on Linux from now on.