I generally prefer slower but you do what works best for you!! Postybirb can let you queue it up if you don't want the hassle of doing it manually.

Postybirb is so nice. Good to know it can queue stuff now tho. That'd be good for my spacy-case brain.

I like seeing your artwork a bit at a time because it's more days where I get to see new submissions from you. Whatever is easiest for you though. I can always look through your wonderful gallery so I'm not overwhelmed and seeing it all at once.
So whatever is easiest for you. Got enough to worry about so less stress is better :)

I think a slower posting of art is the best way to go. It can get you more noticed on them main page throughout the day rather than a whole flood of art all at once.

I prefer slower (works also for 2 to 5 pieces a day though ) because it gives more time to look at everything instead of having to fly trough a lot, but it's up to your preference too!