Question

ok , so from what i understand there are two duel platforms
ygopro and devpro , my question is which one is better?
i only used ygopro so far , but sometimes it runs very slowly

The thing is Both don't really differ. They only use different servers and Dev has Launcher and rating system (Which is quite bad).

ok , but does it work faster than ygopro ?

Idk. I use both and they are running pretty much the same speed. Maybe it becomes slow because of your connection?

To me...
I haven't used the official YGOpro, only the percy's server. It's a lot faster, but has a more techy interface.

DevPro is slower, but smooth interface.

i just went to google , typed ygopro, went to official page , downloaded
installed ... at this moment internet browser opened + ygo pro = 20-21 fps
crappy pc maybe the cause? 512 rams

512 what. MB? I think your computer is not powerful if this is the case. Either way, neither of these systems will work "well" for you because your computer is too slow.

tought so