We should have a mechanism to build FDB with profile-guided optimization (PGO). Our preliminary benchmark results showed 4-12% performance improvement depends on the workload.

GET RANGE with the range of 10 keys: 3.71%
GET RANGE with the range of 50 keys: 12.32%
GET and SET on the same key: 9.62%
SET a new unique key: 6.08%
Mix of 8 GETs, 1 GET & SET, 1 SET: 4.17%

Selecting the most effective instrumentation workload should be discussed separately.