A dry run takes about ~1.5ms. Even though it's all done in the worker thread, the locks used can stall loading operations that are about to happen in other threads, and just in general this CPU load is unnecessary.
Disable 'preload fast travel' by default.
Add 'min cache size' and 'max cache size' settings.
Split the 'cache expiry delay' into 'preload cell expiry delay' and 'cache expiry delay'.