after I change DX12 to DX11 and deferred rendering to forward rendering in the project settings.I’ll have to wait for half of an hour for the project to open.(every time)
but if I change back to DX12 and deferred rendering (they are default settings )this problem will fix.I was looking for methods for better performance on older device.i think I should forward rendering. but half hour to open project is not acceptable! I’m begging for help! 
(I don’t know which category should I choose for the post)
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