Good practice is to limit number of widgets - search for post by me about widget caching, as well as the number of objects (yes, a function is an object) that you create.

Also, load/compile time is affected by length of names and embedded comments in the script. I suggest that you also have a look at the ProntoScript site (Philips) with regard to the new PDF and examples they posted on building ProntoScript libraries as they have provided Ant Build file for using the Yahoo Javascript compression tool. This will save you plenty of load time.

FYI, I use a different compression tool that yields very similar results.

Again, a search on compression of this forum should point you to the tools that I use (I think it is ShrinkSafe by DoJo).