MongoDB 1.4 Performance` MongoDB has released a new version, 1.4, which offers improved performance compared to its predecessor, 1.2. The testing was conducted using internal micro-benchmarks that showed significant improvements in query and insert performance, with increases ranging from 10-30% compared to the previous version. Additionally, the performance of creating an index after importing data is faster than before, especially in version 1.4. The test also revealed that performance remained stable even when increasing the number of threads used, up to at least 500 threads. However, there was a notable exception regarding update and upsert performance, which showed slower results with more than 4 hammering threads.