You could also take a peek into the meshes that you're placing into the map. Some objects are considered "high poly" (meaning they have a large amount of polygons) and the higher the poly count is, often times these are the most laggiest meshes for people. Depending on their computer, some people are easily able to handle high poly objects, but if you want to minimize lag, it can definitely help to use meshes with a lower poly count/not with a high poly count. If you have a large map, you could try leaving the spawn point a tad bit less detailed from the rest of the map, so that the users downloading your map won't be suddenly hit with a lag spike. Perhaps leaving a few less object-heavy areas around the map wouldn't hurt, as well. In addition to what was said about collisions above, check through the map to make sure that you haven't accidentally left any random collisions lying around. If you're really worried about lag, sometimes keeping collisions to a minimum can help.
Good luck with your map!
