I need some things cleared out as i cant seem to find anything that explains this to me,

Anyway Say i was making a game, this hypothetical game was about getting to the finish line before the npcs,

the player can walk run and jump and so can the npcs. and the point is to finish first. When making this game what parts would i code(c++) and what parts would i script(lua),

no answers involving things like graphics physics or anything done by the game engine as those would obviously be written in a low level language.

With Lua being faster and easier to write, I'd try to push as much as possible into Lua. What's the point of a scripting language if you don't use it when you can?

This then leaves the "lua is too slow for this" parts in C++ (as well as the lua glue to the C++ libraries).

However, that part could be a lot smaller than you'd think at first sight.

With Lua being faster and easier to write, I'd try to push as much as possible into Lua. What's the point of a scripting language if you don't use it when you can?

This then leaves the "lua is too slow for this" parts in C++ (as well as the lua glue to the C++ libraries).

However, that part could be a lot smaller than you'd think at first sight.

So basically lua it as much as possible until you need c++ for performance reasons,

However, that part could be a lot smaller than you'd think at first sight.

Especially if you use LuaJIT :D Damn, it's fast.

"core" or "non-core" isn't that relevant, more relevant is how often a thing must be done.

In that sense, it depends what "shooting" means. If you mean user pulling the trigger, that happens 5 times a second or so, max? (Billy the Kid player)

If "shooting" means "moving a bullet", that happens once a frame, say 50Hz?

If "shooting" means 1000 enemies all moving bullets, that's say 50KHz?

My guess is that anything less or equal to once a frame is pretty feasible. A game like CorsixTH does pretty much everything in Lua, and that works even without LuaJIT.