Try to use older blender version something 2.8
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If you’re finding blender to be laggy when in the ‘Rendered view’, try switching your render engine to ‘Eevee’ if not done already :).
(Image below to show you how)
Eevee definitely does not produce the same quality renders as Cycles does, but its much more beneficial for the likes of navigation in the rendered view & experimenting with really quick renders!
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Omg!! TYSM!! 
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