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

Totally agree. This performance bug needs to be fixed asap. Overprint preview mode is way too slow and seems to keep getting slower with every update. We need performance with animated zoom while in overprint preview mode as well.

Overprint preview mode needs GPU performance, the animated zoom is painfully slow especially when working on hires print layout documents.

The bug with the red strip when switching back and forth needs to be fixed too.

Illustrator is incompatible on 5K screens, you work very slowly, you contract, you wait in front of it. If the Adobe team installs ai cc with Imac 5K and tries it, they will see the problem. But they persistently ignore this problem and the complaints. I repeat, the ai cc is problematic on 5K displays. 2020 imac 5K has serious performance problems with all computers, if you want 128 gb ram, 32 gb graphics card, it will still run very very slow. You can see the difference by installing the application called QuickRes and choosing 2560x1440 non-HiDPI resolution instead of 2560x1440 HiDPI. When HiDPI is active, it slows down as if using ai cc virtual machine ... If you cannot get 5K imac, I can borrow it ... Hear my voice adobe ...

Yes, reducing the resolution makes it better - but I did not buy a 5k display to work in 2560x1440 or lower.
Please clean up your code Adobe - this should not be an issue on modern hardware

Yes, I also have the same problem, 5K imac and ai cc are incompatible. *******

Evet aynı sorun bende de var, 5K imac ile ai cc uyumsuz. Lanet olsun.

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?

When using overprint preview this app grinds to a halt, it's absolutely awful, please fix / improve

Mac OS 0.15.6,
iMac (Retina 5K, 27-inch, 2019)
3.7 GHz 6-Core Intel Core i5
64 GB 2667 MHz DDR4
Radeon Pro 580X 8 GB

Ai 24.2.3

switching between overprint preview brings my Mac to a slow grind
My expected result... that a professional application is fit for purpose
My actual result.... a slow and un-usable not fit for purchase application that I have no choice other than to use.!!!

Bought about 30 brand new fully loaded i9 MacBook Pros (2019) with Asus 32" 4K ProArt external monitors for my studio. Day one after deployment, users started complaining about a lag that many said they couldn't tolerate. That lag didn't' exist with the older fully loaded i7 MacBook Pro laptops with Apple Thunderbolt displays. So, needless to say, after spending over $150,000 on studio equipment, I had a pretty big issue on my hands. I immediately started reaching out to Adobe and to Asus. Asus swore their computer wasn't the issue. We went through various adapters, cables, etc. And Adobe swore it wasn't their application. But, it was a combination of both!

If you look on Adobe's website for minimum requirements for Adobe Illustrator, it has ridiculously low specifications (Multicore Intel processor, 8 GB of RAM, 1024 x 768 display, 2 GB of available hard-disk space, Mac OS 10.13, 10.14, 10.15). Our equipment exceeded that by far! What they don't tell you is that if you go over the 1024x768 and jump to 4k that you need to be running 60hz on your monitor! I advised them to update their minimum requirements to include this information but I see it still hasn't been included. I bet all of these forums with users having issues wouldn't exist if that info was updated.

Ok, so that was the first part, acknowledging the software needed 60hz monitor to run smoothly. Well, out of the box, my Asus ProArts only ran 30hz. Reading the manual, Asus claimed the monitor could achieve 60hz by HDMI 1 port . You would think the cables that came with the monitor would work, nope! Had to buy several adapters and cables to finally find what allowed the Mac to see the proper refresh rate and resolution. Asus support was no help. I replied back to them with what did work with detailed instructions on what ports and how to get the the selections from the displays preferences. I tried everything but only the Display Port was able to achieve the 60hz at 4k.

So, after getting the appropriate fast 4k 60hz cable (don't do adapters, just do a cable convert direct connect from computer to monitor) and seeing that the monitor was at 60hz, Illustrator worked with NO lag!

If you are using an Asus ProArt monitor, here's the information I sent them on getting it to work. Hopefully this information might help another person. The time/money wasted between Adobe and Asus was horrible.

ASUS ProArt 60hz Steps:
1. Buy USB-C to Display Port conversion cable (https://www.amazon.com/gp/product/B075V27G2R)
2. Plugging in that cable from any of the USB-C/TB3 ports on the MacBook Pro to the Display Port of monitor
3. Change the stream of the Display port to 1.2 from the monitor menu (System Setup > DisplayPort Stream > DisplayPort 1.2)
4. Change the display resolution via advanced method. Enter advanced mode by going to File > System Preferences > Displays, hold down the option key and click on “Scaled”. Click the “Show low resolution modes” to reveal “Refresh Rate”. Select a non-low resolution and select “60 Hertz (NTSC)” from the Refresh Rate option.

This should resolve your problem!

Overprint preview working very slow with 4k monitors on v24.2

What I found is really interesting if you want drasticly speed up performance of Illustrator. Illustrator is much more faster when you are using high refresh rate of the screen. I found this accidentally plugin by side car the ipad pro 2gen (120hz) improved smoothnes and resposivness of the applications. Also decrease much more the delay when resizing object. And yes this is truth, today I have made 2nd test and plugged my gaming monitor (refresh reate up to 144hz) to the iMac and the Illustrator is super fast.
Of course there is a difference when you resize one shapes (rectangle) and when youdraw second and catch both to resie there is a little bit delay but overall experience is awesome on high rate refresh monitors.

This is wired because high refresh monitor are not common in graphic design, because of lack of color accuracy and gamut. The best graphic monitors are on 60hz refresh rate. You have to check this out.

Federico Platón you are absolutely right.
My specs are:
Windows 10 Pro 64bit
AMD Ryzen Threadripper 1920 and AMD RX 580 8gb DDR5 video, Samsung 27" 4k monitor.
You must agree our computer are similar enough to rule out raw computer power.
Also my problem was with a A4 blank document so clearly is a compatibility problem with some specific hardware.
I know is not possible for Adobe to test their software on every piece of hardware on the market but their minimum system requirements are a bit generic.

I'll try and do some more tweaking and testing and see if i get to the bottom of this.
(For now i manage to improve the time by 1-2 sec only by changing the monitor refresh rate so will see where this leads)

I am on Windows 10 with a i7 8th generation.
My monitor is a Dell 27"at 5K.
And my graphic card is a Nvidia GTX-1060 with 6Mb Vram.
I have set a document 2 feet side, with a big text and three squares covering more than half of the artboard, items set to overprint and uplicated about 5 times each. Also have tried scaling all up, including the aartboard, 10x with the same result:
Under 2 seconds to preview. Zooming up/down entering Outline view and going back to Preview overprint takes less than 2 seconds.
I think the graphic card is the main or only player here.
If you use Overprint mode on a 4k or 5k display you need a lot of processing on the graphic chip.
Nvidia seems to have shown a better behaviour with Adobe apps.