Noticeable lag when scrolling large diffs (1000+ lines) in diff viewer

[dcrjodle]

Summary
The diff viewer experiences noticeable lag when scrolling through large diffs (approximately 1000 lines or more).

Expected vs Actual Behavior

• Expected: Smooth scrolling performance regardless of diff size
• Actual: Noticeable lag when scrolling through large diffs

Reported by
@rorychatt

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Slack thread