(I'm not an expert) but it's more than simply code length - it also depends on if the library runs any functions at parse time, and perhaps also how many variab

(I'm not an expert) but it's more than simply code length - it also depends on if the library runs any functions at parse time, and perhaps also how many variables it puts in the global space. For example: I discovered that my tiny localStorage library was taking 300ms to load, and that was because I was doing feature detection at parse-time and that feature detection attempted to actually set an item in localStorage. I postponed that, and got the load time down to 20ms.