Nothing better than download it and try for yourself, it wont explode your pc 
No, but I would have to register an account that will never be used again, spamming both my email and the game's database. Are you always so helpful?
Yes because your core is i3 it will work.but if you have a slow internet connection i think its not playable and its better to do not play..
What would be the min. bandwidth required? (at least from your experience/what you have read/heard).
Shouldn't use too much bandwidth, and it's not graphically intensive. You should be fine.
That said, IIRC, the movement speed in the game is related to your computer speed. Weird, I know, and I'm not sure if that was ever fixed. But you should be good regardless.
Oh, I had heard about other game having that same issue, it was unplayable in any high performance computer. Well, in my laptop ran fine, it took a while to start because Java (and my laptop, in general) has been behaving weirdly lately. I already finished the tutorial, till now the game does not seem very fun (maybe when I was young and used to waste a lot of time without regreting I would have found it funnier). I will play for a few days and see if my perception of it changes.
Thanks to everyone who commented on this (my question).