It loads all the bricks
I can see people moving in the game
But it says "Waiting for Character"
As far as I know, A lot of people are experiencing this
You see, a game has to load first. Even if the bricks are loaded, your avatar has to load onto the game first. Roblox is always updaating so that may be why. It may become slow until roblox finishes updates.
This happens to me, and it is not caused by lag. Any game that I try to join hangs on 'Waiting for character' (it can even be an empty place). Personally, I think it is caused by the new 'games relevance' system somehow breaking.