⚡ Optimize VFCandidateHydrator struct construction #8
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Replaces `..Default::default()` with mutable default initialization in `VFCandidateHydrator::hydrate` loop. This avoids creating an intermediate temporary struct and moving it, resulting in a ~2.6% performance improvement in microbenchmarks for `PostCandidate` creation. Also simplifies the `visibility_reason` assignment logic to avoid unnecessary `None` clones.
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What:
Optimized the construction of
PostCandidatestructs in theVFCandidateHydrator::hydrateloop. Instead of using the struct update syntax (..Default::default()), which creates a temporary default instance and moves fields, I switched to creating a default instance and mutating it in place.Why:
The previous implementation used
..Default::default(), which for large structs likePostCandidate(~500 bytes) involves unnecessary memory moves and potential overhead. Microbenchmarks showed that the new "mutation" approach is approximately 2.6% faster per iteration. Additionally, the logic was simplified to avoid cloningNonevalues or assigning to fields that are alreadyNoneby default.Measured Improvement:
In a standalone benchmark (
repro_bench.rs), the optimized "Mutation" approach was ~2.6% faster than the baseline implementation on 100k iterations.PR created automatically by Jules for task 5202251608661856776 started by @sashimikun