Client lag but not in Studio

I’ve made a little dancing stage game, there is nothing much just the music in sync with the lights and a SurfaceGUI that says what song is playing now.

The issue: On studio the game looks good, music is perfectly synced with the GUI and the lights are not bad, also on sync with the beat.
But on client often happens that the stage just stops without any motivation and no songs will play, causing a loop and looking like is all off.

Does anyone know how to fix this?
Link to the game if you want to check: [FIXED!] Dancing Stage Showcase - Roblox

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Do you have a free model?, check the microprofiler.

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all models are created from zero, i logged now and seems like it works, i guess depends on my connection(?)