> I have done some preliminary tests: with a script (a small program) that standalone runs in 0.4 seconds, the extra network requests that Apple performs are taking that number to 6 seconds in average, and in some cases when my wifi is slow, 70 seconds.

I just do not believe that. It sounds like a bug in a beta release. I'm sure I would have noticed if every ls I run took 6 seconds, and I'm sure many others would have too. Heck, I've used a Mac with the network turned off and it sure doesn't just refuse to run everything.