Eval Performance skill: what it does and how to install it

What it does. Uses binlog analysis first to measure MSBuild evaluation time, count project evaluations, inspect global properties, import depth and property functions, and falls back to diagnostic logs, /pp preprocessing and performance summaries. It connects measured costs to targeted changes such as narrower globs, excluded directories, fewer imports or graph builds, while disabling SDK defaults only as a last resort.

When to use it. Use it when a build is slow before compilation and evaluation is shown to be the bottleneck. It does not cover compilation or target execution slowness, incremental-build problems or non-MSBuild systems.