Merging Scripts/High Memory Usuage

I experience high memory usage and get lag every now and then when I drive at high speeds/medium speeds thru/near towns. I did some research and I found out that people merge resources. I’ve tried to find a tutorial to make sure I don’t fuck things up but I couldn’t seem to get any luck. If anyone has experience with merging resources into one .lua and if it works the help would be appreciated.