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2

Why is Acrobat Pro still not multithreaded?

Community Beginner ,
Mar 03, 2023 Mar 03, 2023

Does anyone know why Acrobat is still not multithreaded? I regularly use Acrobat Pro 2020 (standalone) to OCR single pdf files of c.2,000 pages or more. I am doing so as we speak on my i7-13700K 32gb DDR5-6400 machine. Acrobat is still single-threaded, so I only get 10% ultilisation and the task takes as long now as it did on my 5-year-old pc becuase it's limited to using one core, with the other 15 cores sitting unused. For a professional piece of software which should be the gold standard for the pdf format, that is embarrassing. 

 

Does Adobe have any intention of implimenting multithreading in future versions? Does anyone know of any standalone software which would do this job until then for less than c$100? As my work involves legally privileged files I can't upload the file to an online services to do this and as I only do this a few times a week, an enterprise level solution is out of my price range. 

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Scan documents and OCR
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Adobe Employee ,
Mar 03, 2023 Mar 03, 2023

Hi @BenBoucher-Giles 

 

Hope you are doing well and sorry to hear that.

 

Are you trying to run OCR on multiple pages of the document at once, If yes, please go through the help page https://helpx.adobe.com/acrobat/using/scan-documents-pdf.html and refer to header Recognize text in the scanned document and see if that works for you.

 

Let us know if you are referring to something else.

 

Regards

Amal

 

Got your issue resolved? Please label the response as 'Correct Answer' to help your fellow community members find a solution to similar problems.

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Community Beginner ,
Mar 03, 2023 Mar 03, 2023

@Amal.  You've entirely missed the point I'm afraid. It's not that I can't carry out OCR. It's that your application is single threaded which means that undertaking the OCR process for a 2,000 page pdf takes 25minutes when if your company had bothered to multithread your software it would take 5m. It's a very annoying and amateur aspect of the software. Not what I would expect from so prestigious a company when a simple google search suggests that people have been calling for multthreading in acrobat for ten years +. 

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Adobe Employee ,
Mar 08, 2023 Mar 08, 2023

Hi @BenBoucher-Giles 

 

We are sorry for the confusion. You may share your feedback with the development team using the link https://acrobat.uservoice.com/

 

Regards

Amal

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New Here ,
Jun 29, 2023 Jun 29, 2023

I think adobe software team isn't that high level. Apart from multi-threading or multi-processing (like Chrome browser) There are many things that is not being fixed or imporved for really many years (like slow search speed). What can I say when I'm using free version.  I don't think the payed version will be better in those aspects.

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Community Beginner ,
Jul 09, 2023 Jul 09, 2023

They have a number of field-leading products so they must have some competent programmers?!? The paid version (in all incarnations up to 2020 pro) is just as slow. 

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New Here ,
Dec 20, 2024 Dec 20, 2024

I agree with you, but it's clear they want to move to cloud hosted files where you just "upload it to them" and such.  I have unearthed and reformatted and repurposed some old servers, with LOTS of cores, just to do OCR and file size reduction on my paid Adobe account.  This means I RDP into an older server box but it has WAY more overhead for CPU/RAM intensive tasks.  But alas, Adobe cannot make use of it still, and likely never will.  They really really could gain back a lot of goodwill if they let us use our own resources better.  

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Adobe Employee ,
Dec 21, 2024 Dec 21, 2024

Hi @Ryan206,

 

Hope you are doing well. Thanks for writing in!

 

Would you mind upvoting and adding your comment here: It would be great if Acrobat was multi=threaded. I routinely have to OCR 4000 page documents which a...?

 

I would love to take this up with the devs for review and future implementation.

 

Do let me know if you have already done so.

 

Thanks,
Souvik

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New Here ,
Dec 23, 2024 Dec 23, 2024

Certainly, I will post to that as well.  I have a lot of sensitive data that will never be uploaded to any cloud service, ever, so I have to use my old servers to OCR and file reduce over the weekend.  Another tweak that would be helpful is adding a folder to the file size reduction tool - you can only add a list of files at this time. I'm sure a lot of other network administrators would like to leverage their on-site CPU cores and tremendous amounts of RAM.  It's one of my older servers, but it has a dual CPU board for LOTS of physical cores and 256GB RAM, and it's not running any VMs any longer.  I'm literally only using it as a workhorse for Adobe, and I'm the only on on the machine.  It's pretty sad that Acrobat Pro/DC are not multithreaded at all, and it struggles to do simple things when it's given a very very very robust amount of computing power. 

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New Here ,
Dec 27, 2024 Dec 27, 2024

I run into the same problem as you with running OCR on large insurance files which are pdfs of a wide range of formats from internal system documents, system notes, screenshots, emails, images, police reports, appraiser reports, etc.  Searchability was the stumbling block in one case which went through several hands before I OCR'd the files and located where a vehicle VIN was added to the policy of a 30-40 truck carrier that added and took away trucks frequently. Their insurance company said there was no coverage for vehicle because it was never added.  No one found the VIN on any endorsement. I put to rest a $500k problem because I let the program run for 45 minutes on my machine.

 

Now, to take care of the problem, we put OCR tasks on an old machine, limit everything else and let it OCR files while we work on other things.  Reminds me of a friend in the 1980s who loaded his dot matrix printer with paper and printed out an inventory report for his father's retail stores overnight. 

 

The problem that brought me here is that only pdfs hang when called from our case management software. These are pdfs from 500k to 5mb.  This problem is similar to the Creative Suite folks who complain that some functionality is slow or delayed when zooming in or performing other tasks.

 

 I discovered a possible interference earlier today which has nothing to do with Adobe. 

 

I have a spreasheet open at all times.  For a separate reason I went into the Advanced settings of Excel and scrolled through the menu.  I stumbled across "Formulas - Enable multi-threaded calculations"  Below it reads "Number of Calculation threads" .  What was selected by default was "Use all processors on this computer:  12."  Then in the General section was checked "Enable multi-threaded processing." 

 

I could be way off base on this.  I'm not a computer anything, but from working with Microsoft products a long time, my gut instinct is that Microsoft requires x,y & z before any other programs pull functionality away from its software. 

 

If Adobe needs to build a page and needs a processor to do so, then it needs one processor that Microsoft has allocated for its programs by default.  When I open two or three pdfs, Excel shares.  When I try to open more it's like Excel doesn't want to share the processors it was allocated and the Adobe page doesn't build until the allocation is resolved.  I even spoke with the owner and developer of the case management software with two of his devs via zoom and replicated the problem while he watched his program hang and could not explain what or why. 

 

In additions to all of the things in the linked Adobe thread, it might be that some other programs need to be limited to their own lanes, so to speak.  For what it's worth....

 

 

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New Here ,
Dec 30, 2024 Dec 30, 2024

The main thing to remember is that Win10 and 11 make the resources available. For example, one of their other products, Premier, IS MULTITHREADED.  It shows that it can use resources, and it's up to the user to manage them (i.e. if you are trying to play a video game while Premier is rendering, you are robbing resources from it) 

 

This is not a Microsoft issue whatsoever, the OS makes itself ready for anything.  This is entirely a decision by Adobe to have limitations on the product, and like you mentioned, there is no way to even opt to bypass it.  (what I mean by this is your detective work in Excel - there ARE no such settings in Acrobat Pro/DC - the program is simply hard capped on how it functions)  

 

So, as people continually get frustrated with the time it takes to do OCR and/or page size reduction or other transformations, it doesn't have to be this bad. Adobe DOES know how to make multithreaded applications that run on Windows just fine and use lots of overhead just fine.  My old dual socket Xeon, with all of its RAM, are fully dedicated to Adobe. But it's barely even trying. Nothing else is even running other than core OS normal stuff.  It's quite frustrating to need to run OCR for days and *THEN* run page size reduction... for more days... 

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Explorer ,
Jul 28, 2025 Jul 28, 2025
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I don't think anybody actually knows. The Adobe AI and seemingly bots replying like @Amal. certainly don't understand the question or concern on what is multithreading. I

 

haven't seen any independent tests between known multithreading OCR apps and without. Asking AI gives conflicting results. Adbpe remaining silent on the issue isn't a good thing either.. 

 

@defaultwka59c2b2kki 

@Ryan206 

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