compressed because rawblocks
the door cannot collide with walls nor the floor, because of collision groups
why is the door still so slow 
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It may be because the walls are making it harder for it to rotate. I had this problem before… just add a NoCollision constraint between the two
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Sorry, I read the post again and realized that whatI said would not help. I don’t know how collision groups work so I would try everything possible…
this isbecause of networkownership problems, to fix this maybe you should could try setting a networkowner to the player that touches door. sometimes it will automatically set
code inside door biggest part:
script.Parent.Touched:Connect(function(Player)
if game.Players:FindFirstChild(Player.Parent.Name) then
script.Parent:SetNetworkOwner(game.Players:FindFirstChild(Player.Parent.Name))
end
end)