in-memory DB startup time SQL Server
Not only must all memory-optimized data be loaded into memory before any tables are available in the entire database, but because non changes to indexes on memory-optimized tables are logged, all indexes must be recreated on all memory-optimized tables as well.
That's why it's critical to have fast storage, and spread your containers across multiple volumes.
http://nedotter.com/archive/2016/09/in-memory-oltp-the-moving-target-that-is-rto/
http://nedotter.com/archive/2016/02/backup-and-recovery-for-sql-server-databases-that-contain-durable-memory-optimized-data/