Turned some debugging on, and found at least where the time hit takes place:
2025-02-20 18:11:18.802 UTC [708M] DEBUG_DATABASE: Imported 2 rows from disk.sqlite_sequence
2025-02-20 18:15:39.971 UTC [708M] INFO: Imported 160655 queries from the on-disk database (it has 112633405 rows)
You can see it takes just over 4 min. for FTL to read-in the on-disk database. The first log line is not the database its reading in. Not sure why it's so slow in 6 compared to 5.
Okay, strangely enough, it instantly reads this in after just stopping the FTL service. It now only has this time hit after a full restart.