MongoDB 8.0 Now Available with Performance Gains and Enhanced Sharding
Briefly

The team came up with architectural optimizations in MongoDB 8.0 that have significantly reduced memory usage and query times, and have made batch processing more efficient than previous versions.
Our internal build system-which our software developers use daily-is built atop MongoDB, and when we upgraded to MongoDB 8.0 we saw query latencies drop by approximately 75%.
Read at InfoQ
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