lag and high CPU usage on macOS 26 when scrolling through big scrollback

[VisualEhrmanntraut]

Pre-submit Checks

• [x] I have searched Warp bugs and there are no duplicates
• [x] I have searched Warp known issues page and my issue is not there
• [ ] I have included the logs (optional, but helps expedite the bug fix). Log gathering intructions

Describe the bug

on macOS 26, when there's a lot of scrollback history, scrolling through it will spike CPU usage and lag

To reproduce

I think it's self-explanatory

Expected behavior

it should be smooth

Screenshots, videos, and logs

Sample of Warp.txt

Operating system (OS)

macOS

Operating system and version

26.0 Beta (25A5279m)

Shell Version

fish, version 4.0.2

Current Warp version

v0.2025.06.04.08.11.stable_03

Regression

No, this bug or issue has existed throughout my experience using Warp

Recent working Warp date

No response

Additional context

No response

Does this block you from using Warp daily?

No

Is this an issue only in Warp?

Yes, I confirmed that this only happens in Warp, not other terminals.

Warp Internal (ignore): linear-label:b9d78064-c89e-4973-b153-5178a31ee54e

None

[dannyneira]

Thanks for letting us know, we're not actively testing on macOS Tahoe 26, so we appreciate the heads-up. Keep in mind that its a beta OS so some of the issues with performance may be addressed by Apple and may not be related to Warp.

To anyone else facing this issue, please add a 👍 to the original post at the top or comment with your details, and subscribe if you'd like to be notified.

[ildunari]

I get the lag even with minimal scrollback history. Seems like a compatibility performance issue, not just a content issue. Though I've noticed scrolling and overall increase in stutter on a lot of apps, so I wouldn't necessarilty blame it on just Warp.