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If you want to call a function every few seconds and you don't need high accuracy, wouldn't it be better to use minetest.after instead of globalstep? What is more efficient?

minetest.after() is not a core function and is based on register_globalstep too.
Lua is fast, thus, you won't notice any speed increase when you use globalstep instead of minetest.after

https://github.com/minetest/minetest/bl ... sc.lua#L40