Purpose

based on changes in:
#15834

simplifies these changes but retains 20 -25% performance improvement for headless graph load time. Note that this % does not improve load time of graphs in Dynamo UI significantly, but it will be valuable for headless use cases.

1. cache category name - it does not look like ZT categories change since they use either the class name or the compiled attribute. So these seem safe to cache.
2. Instead of building a cache of loaded assemblies - just use Assembly.Load which internally caches if an assembly is already loaded - confirmed this is the case here:
   https://github.com/dotnet/runtime/blob/main/src/coreclr/vm/appdomain.cpp#L2554

I verified the 20% number using the mars v3 graph. (~700 nodes)

Declarations

Check these if you believe they are true

• The codebase is in a better state after this PR
• Is documented according to the standards
• The level of testing this PR includes is appropriate
• User facing strings, if any, are extracted into *.resx files
• All tests pass using the self-service CI.
• Snapshot of UI changes, if any.
• Changes to the API follow Semantic Versioning and are documented in the API Changes document.
• This PR modifies some build requirements and the readme is updated
• This PR contains no files larger than 50 MB

Release Notes

improve graph open time in headless contexts.