Brief blurriness when scrolling in scanned PDF

Hello all. I frequently find that when scrolling through pages in a scanned PDF, it takes a second or two for the page images to resolve; that is, they appear blurry at first and only a second or two later do they resolve into clear page images. The PDFs are about 50 pages long, in color, and were scanned at 300 dpi with moderate compression (they are about 75mb each). Is there any way to fix this? Thanks.

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