Issue
VSTest automatically picks up all the *TestAdapter.dll assemblies present with the assembly tested. We don't offer a way to change this yet. A customer reported on a feedback ticket that this delays their tests for a long time.
Proposal
Since TestAdapters and DataCollectors can be in the same assembly, specifying a different load order is not feasible. We'll use the same loading order for the assemblies, and provide a way to exclude them.
AB#1370910