[SDPhantom]

Just my two cents in on the topic. With Blizzard's recent obsession over rewriting APIs into returning tables, the inherent problem in doing so is it can easily turn into a memory hog. The two most expensive value types in Lua are functions and tables. In your function, you're requesting 3 different tables from such APIs. Even though you're only getting their length, Lua still allocated the memory to store them and they continue to wait for a garbage collection cycle to pick them up. It doesn't matter if you didn't store them in a variable, they existed for the moment they were used in an expression and therefore still take up space in memory until Lua gets rid of them later.