go-pkgz / expirable-cache / 14459642506

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Optimize core cache operations for performance, Go 1.24 (#18)

* Optimize core cache operations for performance, Go 1.24

Improve performance in frequently used cache methods:

1. Values method:
   - Move time.Now() outside of lock
   - Simplify iteration

2. DeleteExpired method:
   - Replace key slice allocation with direct list traversal
   - Cache time.Now() call for efficiency, move out of lock
   - Avoid redundant map lookups
   - Properly handle list traversal during element removal

3. Add method:
   - Cache time.Now() and move out of lock

All optimizations preserve API compatibility while reducing allocations and CPU work.

Signed-off-by: Mathias Bogaert <mathias.bogaert@gmail.com>

* Remove unused method.

Signed-off-by: Mathias Bogaert <mathias.bogaert@gmail.com>

* Downgrade go requirement for v3 back to 1.20

* Apply performance optimizations to v1 and v2 versions

- Move ttl check and time.Now() outside lock to reduce lock contention
- Optimize DeleteExpired with direct list traversal
- Remove unused removeOldestIfExpired method
- Use same inline expiration check

* Update benchmark results in README files

- Update benchmark results in main README with latest performance metrics
- Update benchmarks README with current numbers
- Adjust performance improvement percentages to reflect latest changes

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Signed-off-by: Mathias Bogaert <mathias.bogaert@gmail.com>
Co-authored-by: Dmitry Verkhoturov <paskal.07@gmail.com>

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