When I am playing Minecraft on my PC, it will start lagging slightly when I press 'A' and a lot when I press 'S'. This happens halfway through gameplay (2-20 minutes) and I have only had them problem on a survival/hardcore world. When I press one of the keys, the whole world will quickly flash as if the chunks are re-loading. Can anyone tell me why this problem occurs or how I can potentially fix it?
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