Question Issue with Alienware AW2518H

Jan 30, 2020
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So I've been noticing this small detail that has been concerning me for a while. I recently bought an Alienware AW2518H 240Hz and I noticed that whenever I open a game or alt tab this happens for a second : https://postimg.cc/KkT85sLj then the game screen goes back to normal. I wanted to know if this is normal or I should be concerned and how can I fix it? It's plugged on a displayport and I've tried switching ports