But it works perfectly fine in Illustrator CS6!! Because of this I have switched back to a 12 year old software! Nice programming Adobe!

Same problem:

AI 28.1

Windows 11
Intel Core i7-14700K 3.40 GHz
96.0 GB RAM
NVIDIA GeForce RTX 4060 Ti

Screen resolution 3840 x 2160 (HP Z27k G3)

It seems to be a problem of the screen resolution.: the speed of the overprint preview gets normal when setting manually the screen resolution to a lower level.

Dear Adobe Customer Support,

I hope this message finds you well. I am writing to seek assistance with a recurring issue I have been experiencing while using Adobe Illustrator, particularly when enabling the "Overprint Preview" feature.

Description of the Issue:
I have noticed that, when I enable the "Overprint Preview" option in Adobe Illustrator, the software experiences severe slowdowns and performance issues. This problem persists despite the fact that my computer system is equipped with high-end hardware, including a powerful CPU and graphics card. Interestingly, this issue does not occur on one of my colleague's systems, which has similar specifications and also uses the same version of Adobe Illustrator.

Computer System Specifications:
- CPU: Intel(R) Core(TM) i7-5820K CPU @ 3.30GHz 3.30 GHz
- GPU: NVIDIA GeForce RTX 3080 Ti
OS: Windows
Version: 11.0
Process Architecture: x86_64
Built-In Memory: 98214 MB
Illustrator Version: 27.9
Troubleshooting Steps Taken:
I have already undertaken several troubleshooting steps to address this issue, including:
- Ensuring that all hardware drivers are up to date.
- Verifying the compatibility of my graphics card with Adobe Illustrator.
- Updating Adobe Illustrator to the latest version.
- Resetting Illustrator preferences.
- Simplifying complex documents.
- Checking monitor color profile settings.
- Ensuring the operating system is up to date.
- Reviewing and disabling third-party plugins.

Despite these efforts, the issue remains unresolved. I have also reached out to Adobe's customer support, but the suggested solutions did not resolve the problem.

Request for Assistance:
I kindly request your assistance in diagnosing and resolving this issue. Given the high-performance capabilities of my computer system, it is puzzling that I continue to experience performance problems with "Overprint Preview" in Adobe Illustrator. I would appreciate any guidance, recommendations, or solutions you can provide to resolve this matter.

If you require additional information about my system or specific diagnostic data, please do not hesitate to ask. I am eager to work collaboratively to identify and rectify the underlying cause of this performance issue.

Thank you for your attention to this matter, and I look forward to your prompt response.

Sincerely,

I have the same problem, ever since I started using my iMac 5K 2019.

- Switching to Overprint Preview or Pixel Preview.
- Scrolling the screen and "Hand tool" is slowing down.
- It also happens with newly created empty documents.
- Artboards and guides are grayed out.

Workaround
- Make the window smaller.

-------------------------

私もiMac 5K 2019を使うようになってからずっと同じトラブルを抱えています。

- オーバープリントプレビューまたはピクセルプレビューに切り替える
- 画面のスクロールや「Hand tool」の操作が遅くなる
- 新規作成した空のドキュメントでも発生する
- アートボードやガイドの表示もグレーアウトしておかしくなる

回避策
- ウインドウを小さくする

-------------------------

macOS Monterey（12.6.9）
iMac (Retina 5K, 27-inch, 2019)

プロセッサ／3.7 GHz 6コアIntel Core i5
メモリ／40 GB 2667 MHz DDR4
グラフィックス／Radeon Pro 580X 8 GB

Overprint preview illustrator very slow

Please solve this problem, I'm having a hard time using it.

Overprint preview illustrator very slow

Please solve this problem, I'm having a hard time using it.

imac 27 " 2020 5k CPU i5 3.3 / Ram 40 gb / GPU 4 gb

Same problem
Win 10
i7-8700k
DDR4 16GB
GTX 1080
and on 3 other PCs:
Ryzen 5,7, intel core i5
16-24 RAM DDR4
RX480
Illustrator is unusable

Yes, all documents behave exactly the same.

Overprint preview forces Ai to turn off GPU preview.
Usually it’s not that a great difference (maybe it’s because I am used to CPU while GPU still feels faster)... i5 is a quite fast thing... It might be a document that you are editing.
Do all you documents behave the same way?