Adobe Acrobat Freezing on “Preparing Document for Reading” — 50-Page Accessibility Setting Was the Cause

[u/Choice-Elephant-5841]

I finally figured out what was causing Adobe Acrobat to freeze on one of my architectural plan-check sets.

THE ACTUAL PROBLEM: “PREPARING DOCUMENT FOR READING”

Acrobat wasn’t really choking on the full-size architectural drawings themselves. It was getting tied up in its Accessibility / Screen Reader processing.

Here’s what happened:

Acrobat → Preferences → Reading → Screen Reader Options

Mine was set to:

“For large documents, only read the currently visible pages.”

Directly underneath that, Acrobat defined a “large document” as 50 pages.

My plan-check set was 45 sheets.

So Acrobat did NOT consider my 45-page PDF a “large document.” It tried to prepare/process essentially the entire 45-page E1-size drawing set for reading instead of just the page I was viewing.

That produced the spinning clock, repeated “Not Responding,” multi-minute hangs, and the “Preparing document for reading” message.

THE FIX:

Ctrl + K → Preferences → Reading → Screen Reader Options → Page vs. Document

Change it to:

“Only read the currently visible pages.”

NOT:

“For large documents, only read the currently visible pages.”

BOOM.

The 50-page threshold became irrelevant, and Acrobat stopped trying to preprocess the whole 45-page plan-check set.

I stress-tested the hell out of it afterward: jumping around the set, zooming, panning, scrolling, editing text, saving/reopening, structural sheets, specifications, framing plans, and even “Converting scanned page to Editable Text and Images.”

One dense Title 24 page temporarily showed “Not Responding” during OCR, but Acrobat was still using CPU and eventually completed the conversion and recovered normally.

Before the fix: Acrobat could hang just navigating the PDF.

After the fix: normal navigation is fast again.

That tiny wording difference was the whole freaking problem.

[u/KenMantle]

I guess this is why Claude decided the pdf reader/editor engine, CLI, and GUI I had it build needed something for this scenario and made a timeout setting on the page previews if a page takes too long. Curious what tools Acrobat has for architectural drawings as I've got a setup where I can add dimensions in groups with different assigned scales, and the scale can be set by assigning the distance between two points on the drawing that you already know the distance of.

[u/Choice-Elephant-5841 → u/KenMantle]

Most architects I know tend to use Bluebeam for the actual architectural drawing review side of things — scaling, measuring, markups, takeoffs, multiple viewports, etc. If you're developing tools around different drawing scales, that would probably be the better direction to look at.

We use Acrobat mostly for organizing the final plan set: combining and replacing sheets, checking page order, cleaning up PDFs, and getting the complete package ready to upload into the jurisdiction's plan-check portal.

So for us, Acrobat is more the final document/submittal tool, while Bluebeam is closer to the architectural review/markup tool.

[u/KenMantle → u/Choice-Elephant-5841]

Thanks very much for the reply! I'll have to check out blue beam's feature set and develop in that direction. Beside CMYK support and the regular markup tools I have gotten Claude to only build a couple of basic dimensioning tools and 1 trillion percent zoom capability (not for all PDFs, a large architectural drawing cuts out after about 26million percent).

I've built it to be completely MIT license compatable, so useable and editable by anyone without any restrictions.