Graph build should log that projects are being evaluated

[jeffkl]

Summary

Graph builds log when all projects have been loaded:

Static graph loaded in 0.708 seconds: 1 nodes, 0 edges

But for large complex builds, nothing is logged for quite some time, leaving a user wondering what is going on.

Background and Motivation

In this repository, I'm waiting for 30 seconds before anything is logged:

Static graph loaded in 29.808 seconds: 408 nodes, 4965 edges

Proposed Feature

I think MSBuild should log something at the before loading the graph:

Static graph is loading projects...

Alternative Designs

No response

[yuehuang010]

FYI, I manually enabled gcServer in the msbuild.exe.config to speed up graph build at the expense of extra memory usage. I also set gcHeapCount=3 to soft cap the memory growth. Play with the number to see what works best. On my machine, it improved the graph time from 20s to ~10s.