I am using Adobe Acrobt X Pro and utilize the tool under document processing labeled "Optimize Scanned PDF". When doing so, it always warns me:

Acrobat has detected a page that is already optimized. Do you want to run
optimization on this page again?

[x] Apply to all compressed pages

OK    Cancel

You have to click OK to perform the compression which I need to do due to large size of files. I make them high resolution in my Canon MX860 scanner to get best possible OCR.

I wonder whether Canon scanner is doing this prior optimization?

But to my main question, after performing this optimization, when scrolling from page to page in the document, the page first renders blurry and highlights are omitted, then after a brief period, re-renders non-blurry and fully readable by the eye with highlights drawn.

Is this related to the warning? If so, is there a way to scan the documents on my scanner and not have them per-optimized. If not, what can I do to avoid this situation, where else might the prior optimization be coming from?

One last issue I notice is that sometimes it does not finish re-rendering a second time and leaves the page blurry starting mid-way down the page. When it does this any highlighting I have applied is not shown either and I have to page up and down again to get it to attempt to render a second time.

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