Are you serious? I have Roblox on maximum settings stable 50 fps, what are you talking about?
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Roblox can basicly run on the most trash phone ever, and still be at least 15-30 fps (10 on best graphic settings).
Btw, it almost complety depends on the game you play on roblox.
If you play a game with like 3 Objekts, the fps will never go below 60.
If you play a game with like 2 billion objekts, the fps will (unsuprisingly) never go higher than like 5 fps (also, dont blame my english, i am not actually english)