I'm currently using Illustrator 2025 (29.8.2) on a Windows 10 device (Dell Precision with i7 chip, 16GB RAM and NVIDIA T1200) and noticed that after a while of using the app, I was getting severe lag when trying to do anything. Even trying to close Illustrator after the lagging started could take up to two or three minutes.
After looking at advice from others, I remove all the tool tips and contextual options (all redundant to me anyway) and tried opening the app from the Adobe Cloud Desktop app, rather than from the start menu, but again, after a while, it would start to heavily lag. All drivers were up to date.
I was baffled by this until I realised that the lag was occurring immediately after I was creating a new link within the Share for Review (SfR) option or clicking the 'Update content' option. I use SfR within Indesign on a daily basis because I'm working on projects with multiple staff across remote sites, so it's an incredibly handy tool, and have started to use it more and more in Illustrator.
Because it works so well within InDesign, it never occurred to me that it would be an issue here.
Highlighting it here to hopefully raise awareness of it to the dev team and to possibly help others who are having similar issues.