I found out something weird. 'Memory Blocks Log' tells me Block1 is 256MB less than what I set the value of DefaultHeapInitialAllocMB in SKSE.ini. e.g. DefaultHeapInitialAllocMB=768, Block1 is 512MB. Anyway, I originally set DefaultHeapInitialAllocMB=768 but after looking at MemoryBlocksLog.log with the highest at 500-ish (dangerously close to 512MB in Block1), I've changed it to DefaultHeapInitialAllocMB=896. Now, Block1 is 640MB and the highest is around 550-ish at Riften. For some reason, if I just adjust DefaultHeapInitialAllocMB, the game CTDs on main menu. I found out that I have to adjust ScrapHeapSizeMB as well so I set it to ScrapHeapSizeMB=512. The time to load a save file (continue in main menu) is still about the same - 45 to 50 secs. until the charater shows up. It doesn't bother me anymore - at least I can guarantee ILS won't happen anymore, so thanks. About the map. I'm just gonna leave uLockedObjectMapLOD=8 there. ;)