emmm，this confused me.I don’t have better idea, if change the pdf engine is another way?
You can email developer ,that’s might be helpful.
I asked because I thought the developer would answer if I asked here. If the developer doesn’t respond here, I will send an email to the developer. Is the document clearly expressed on your device? I expected this to be a problem with all the iPad.
Hello
Hello, how big is this PDF of yours? Is it convenient to send us this notebook for testing?
Kind Regards,
MarginNote-Relight
Support Team
We can send you a document. Since it is for testing, I have extracted only two pages and uploaded them.
But isn’t the problem of blurring vector graphic font documents a compatibility problem with iPadPro 11inch ?
doc1 MarginNote3 test.pdf (1.0 MB) doc2 MarginNote3 User Guide.pdf (2.1 MB)
I’ve backed up and uploaded another document with a little smaller capacity. This document is also very blurry. The last picture was opened in the Adobe Acrobat Reader app. It needs to be expressed clearly like this to be normal. Please analyze it. I sincerely hope that this problem will be resolved as soon as possible.
07편 (2021-01-14-14-28-09).marginpkg (34.7 MB)
no,some books are clear and some not.But I study on my pc with MN3 recently, so it’s not a puzzled problem with a much lager screen 
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1楼说mn内置的userguide也模糊啊，我感觉应该不用发PDF测试吧。可能是别的什么问题。
I also think so. I feel it is more a matter between the pdf renderer and iPad Pro than the characteristics of the document.
Today, I am also studying patiently even though the document looks blurry… (The document should look as clear as the second image.)
my PDFs and mn3 userguide don’t have this problem. So sorry i can’t help you. 
PS: my scanned PDFs are all 600dpi and 1200dpi, scanned by fujitsuix1500.
Thank you for your answer. I look forward to hearing from the MarginNote-Relight Support Team. My iCloud lacks capacity, so I think 300dpi is the limit. And I think 300dpi is enough because it’s clearly expressed in other pdf apps.
Hello
Hello, I've tried it without any problems, are you on version 3.6.19? Try to database Defragmentation for it?
Kind Regards,
MarginNote-Relight
Support Team
Thank you for your answer. Yes, the version is 3.6.19. I’ve just executed the Database Defragmentation. The loading speed of the mind map has improved, but there has been no change in the quality of the documentation. Is there no other way?
(This is a MN3 User Guide. Screenshot taken by adjusting the font size of the mind map and the font size of the document to be similar. The font on the mind map is clear, but the font on the document is blurry.)
Hello
Do you enlarge the PDF a bit? If it is very small, it will be blurred.
Kind Regards,
MarginNote-Relight
Support Team
To make it easier to understand, we took a screenshot of the document by making it smaller. However, I always feel that the document is blurry (the first screenshot I uploaded to the post shows that the document was taken in a big way, but it was blurry). This is because documents are very clearly represented in other document apps.
As you said, the larger the document, the clearer it becomes. However, if you are zooming in on a document and you do not try to swipe your finger vertically, you will always use it to fit the frame because of the inconvenience of the document moving from side to side when you flip the page. This is because even if you swipe your finger roughly, you can move the page as you intended.
The screen shot may not seem to make a big difference, but reading the document all day makes my eyes very tired.
The same symptom found while searching for forums. It’s all from the Mac, but my iPad Pro has exactly the same symptoms. If there is no way I can do it, I sincerely hope you can improve it through the update!
Hello
However, I really don't have it as blurry as your books.
If the PDF is too large it may cause slow rendering, but a normal small document should be clear and blurry on a mac due to some screen rendering issues.
On the right is PDF expert for comparison.
Compare with notability
Kind Regards,
MarginNote-Relight
Support Team
Thank you for uploading the screenshot. In the same situation as the screenshots you uploaded, the documents are displayed on my iPadPro 11inch in a similar quality to the screenshots you uploaded. In my opinion, when mind maps and documents are shown together, I think the quality of other apps is lower when multi-testing them. So I checked again by adjusting the size of the document window in MN3.
I usually run two document apps, such as Screenshot 1 and Screenshot 2, to refer to multiple documents and understand their content. (because documents in the Acrobat app are easy to manage on Windows 10. When you’re not reading a document, play a video at the same time.) So you use the screen configuration in triplicate with margin note mind map, margin note document, and other app document.
When using margin notes only, set two-thirds of the screen to the mind map area, such as Screenshot 3, and one-third area to the document window (or video) area. I checked that the quality of the same document is lower when using it like Screenshot 1 and Screenshot 2. (Screenshot 5 doc quality is slightly clearer than Screenshot 4.)
As I analyze them one by one, I feel that there are not many differences in quality. However, I think I feel a big difference when I feel blurry while reading the document. If possible, I would like to read the document in a more clear, consistent quality, even if the configuration of the screen changes.
Does your iPadPro 12.9inch display documents clearly even when you organize the screen like that?
Hello
Yes, it will be blurred after zooming in, so suggest that you zoom in to view the PDF or vertical split the view.
We will consider replacing the PDF kit with a new one to solve the rendering performance problem.
Kind Regards,
MarginNote-Relight
Support Team
Your document is blurred just like my iPad. I rarely use zoom-in. Most use zoom out. The reason is that the screen is too small to express much content on the screen.
In the past, when I used the iPad Pro 12.9 1 gen, I thought it was an advantage that the rendering speed(quickly loading speed) was faster than other apps even though the quality was blurry. The clarity of the document has become more important because it is currently an 11 inch small screen(The reason is that I have to read the document quickly.).
P.S. I think the render engine used by Adobe is fast and the documentation is very clear.
We sincerely look forward to the application of a high-quality renderer as soon as possible. 
实际上我也有这样的感觉，不过用久了也就习惯了。。。。
我一直认为是渲染的问题。
I thought I would get used to the blurry screen, but I can’t.
Because when I turn over the document, it’s very blurry and a little blurry even though it’s the same page, but the status keeps changing.
I hope it gets better soon.