Loading screens - Cfx.re Docs - FiveM
https://docs.fivem.net/docs/scripting-manual/nui-development/loading-screens/
webLoading screens. A special NUI frame is the frame called loadingScreen, which is shown during loading of FiveM, instead of the default client-side loading screen or the game loading screen, after joining into a server. It is specified similarly to ui_page using loadscreen in the resource manifest:
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