This seems to be limited to Safari browsers and does not affect Chrome but when I try to do a cutout on Safari I get a serious lag while the tool is active.
Here's a loom with a demonstration: https://www.loom.com/share/64df103d70e44b099a118f68859be536
2025 Macbook Pro, M5 Pro Chipset, 64GB RAM running Tahoe 26.5.2
Edit: not a new problem, it's been around for at least two or three months. I just don't do many cutouts.
Yup, I'm a strange use case. I can't use chrome for zzTO without breaking the entire button mapping setup on my trackball. It only maps at the application level (no support for mapping buttons at the website level). I've got a lot of hotkeys (especially the new section, arc point, magnify, and midle click drag) mapped to specific buttons on the trackball - and that's muscle memory going back to 2018. Since I'm using Chrome for all of my web browsing activity split across 6 different profiles, I'm stuck with Safari for zzTO. Those same buttons open new tabs, navigate backwards, and control the zoom in Chrome. Can you imagine the chaos?