ResolveAssemblyReference is slow on .NET Core with many references
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Area: Performance
Area: Task: Resolve Assembly References (RAR)
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Description
`ResolveAssemblyReferences` runs unconditionally even on incremental builds (because the user may have installed a targeting pack or, for full-framework scenarios, GACed an assembly). This makes it performance-sensitive.
With the advent of .NET Core micro-assemblies, it has become common to pass many, many references to RAR. This exacerbates performance problems.
@rynowak was kind enough to run a profiler to see this:

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