MLO and map optimization
Custom interiors and map mods make a server feel unique, and they are also the number-one cause of mystery crashes and stutter. The problem is rarely the script; it is asset weight, broken collisions, and missing LODs. This lesson builds a real streamed-interior resource, registers it the exact way FiveM requires, and then takes the manifest apart so you know which file does what and how to measure its cost.
Build it
You are not going to hand-author a binary interior in this lesson. Those files come out of CodeWalker or 3ds Max. What you will do is build the resource that registers an interior the way every MLO must be registered, then prove with a real number that FiveM accepted your registration. That manifest line is the single thing beginners get wrong, and it is the difference between an interior that loads and one the server silently ignores.