Environment

• OS: Windows 11 (fully updated)

• CPU: AMD Ryzen 9 7950X3D

• GPU: NVIDIA GeForce RTX 4070 Ti

• RAM: Plenty of free memory (not the limit)

• Sourcetree: Latest version - 3.4.23.0 (fresh install reproduced)

• Reproduced on another PC with a very similar spec

What happens

• When viewing a changed file in Sourcetree’s built-in diff viewer and scrolling (especially through a moderately sized diff, ~200 lines), the entire system stutters/freezes.

• During the freeze:

• • Scrolling is choppy or stops.

• • Windows UI becomes unresponsive: Alt+Tab, opening Task Manager, switching apps, etc., are delayed by several to tens of seconds.

• • Once the scroll action “finishes,” all buffered inputs suddenly execute.

• Resource usage looks normal while it’s happening:

• • CPU, RAM, GPU, and disk I/O remain low/steady (no spikes).

What I’d expect

• Smooth scrolling in the diff view with no impact on the rest of the system.

What I’ve tried

• Clean reinstall of the NVIDIA graphics driver.

• Fresh install / update to the latest Sourcetree.

• Tested on another machine with similar hardware → identical behavior.

• Using other Git tools’ diff viewers (e.g., different client/external diff) does not reproduce the problem — only Sourcetree’s internal diff view triggers it.

How to reproduce (on my machines)

1. Open any repo with a file that has a moderate text diff (~150–300 changed/added lines; not a huge file).

1. Open the file in Sourcetree’s internal diff panel.

1. Scroll continuously (wheel or trackpad) for a few seconds.

1. Observe the system-wide stutter/freeze; inputs to Windows/UI lag by seconds until scrolling stops.

Notes

• This is not tied to a specific repository or file type; I can reproduce with multiple text files.

• Temperatures are normal. No antivirus pop-ups or obvious background tasks at the time.

Ask

• Is this a known issue with the internal diff viewer on Windows?

• Any flags or settings known to mitigate this (e.g., diff rendering options) without switching to an external diff tool?

• If logs/traces would help, please point me to what to capture (and where in Sourcetree to enable it).
  I can also share a short screen recording if useful.

Thanks!