See for instance https://ci.appveyor.com/project/pythonnet/pythonnet/builds/31089363/job/8vgpb5s1ww5pkrvl

conda build receipt is nearly 4 minutes of 5.

For comparison, the C# embed tests take under 15 seconds, and even performance tests only take about 1 minute. We should see if there is a way to optimize it.