perf: skip redundant EOF queries for virtual entries

[Illustar0]

To be frank, this is a micro-optimization.

According to Microsoft's NtQueryDirectoryFile documentation, when FileName contains no wildcards, there is at most one matching directory entry. USVFS queries here with exact physical filenames; after fully retrieving the entry, the original implementation still called the internal NtQueryDirectoryFile() again, continuing until it hit STATUS_NO_MORE_FILES before concluding the search. This optimization eliminates that redundant EOF probe.

On my machine (i5-12600K, medium-sized modlist with 529 active plugins, using CRDW ACCELERATE mode to avoid redundant per-file size queries during Skyrim’s startup directory traversal):

For the file traversal process¹, this eliminated 220,261 redundant NtQueryDirectoryFile calls, cutting the traversal time from 21.381 s to 18.590 s—a 2.791 s (13.1%) speedup, though that translates to only about a 3% performance uplift overall.

Footnotes

1. Process creation and basic initialization completed (~4.9 s post-launch) → CommunityShaders first Streamline initialization log entry. ↩