For Loops
The pairs and ipairs functions are optimized in Pluto. On a consistent basis, pairs & ipairs loops are 3.5x faster than their Lua counterparts.
How does it work?
It doesn't operate under all circumstances though, the state of the iterator is stored in the to-be-closed variable returned by these functions, which is the last variable they give. If you interact or modify this variable, then the optimization won't occur.
As long as you don't access the last nil value, you're fine.
info
This optimization was published and implemented entirely by Xmelia Hermit.