I think that's because of where you're living.
As you know, ROBLOX's servers centers aren't everywhere, so it takes time for information to be sent. For example, I live in Russia. The closest server is, let's say, in Britain. To get information about players, games and other stuff, you should wait for a bit. (since it has to be filtered) If you want to receive the codes faster, I think you better use LTE or high-speed wi-fi.
Same happens with social network called Amino. |