[Phanto90]

Well there are few general suggestion:

• Not to create useless variables: Create as less variables as you can and manage them in an intelligent way.
• Efficient control of loops: foreach is a good alternative to not-continuous groups (for example players or vechiles)
• Efficient control of array: Do not create arrays with useless cells
• Use packed strings: Packed strings are a good way to save spaces and resources. These are not well known
• Using automata: Sometimes automata permits to save space

Anyway you should create codes that:
-Run codes that take less time to execute as possibile (run few test if you are not sure of a code efficienty)
-Try to code in an intelligent way obviously

Good work.