Nice to see someone actually using time/motion studies to optimize the Thunderbird UI and UX. Actual adults in the room... "Cache search indexes in #LMDB (lightning-fast, memory-mapped B+ trees) and update incrementally on message arrival. Benchmark: 92% of common actions completed in ≤0.9 s (vs. 3.2 s baseline) on Thunderbird 115 with 120k messages." https://lifetips.alibaba.com/tech-efficiency/what-do-you-want-to-see-in-thunderbird