Performance of methods depends on how you’re using those methods. For some of them it’s pretty much impossible to visualize or describe how performance intensive your usage of it is going to be. Calling :Clone() on a single part is of course going to be way quicker than calling :Clone() on a map existing out of 10k BaseParts. If you’re not doing any crazy stuff you shouldn’t have to worry about performance at all, but in the worst case Roblox already has some great tools that help you debug performance. One of those is the Lua performance profiling API.
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