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I have unity 2019, and i try to create a game, but the editor is running too slow
If you're new, goto top menu then build settings. There should be option for player settings. Then goto Quality tab and select High quality replacing Ultra.
U can also press ctrl+R> type %temp% and delete everything in that folder. Those are temporary files
I think that @PrateekPanwar646 meant Windows Logo Button + R, right?