I tried Textual earlier today with some not-so-good results:

- Static completed Markdown scrolling fails the new focused probe. Result: p95 18.86 ms vs 16.7 ms budget, max 232.49 ms.

- Long live Markdown/code update path also fails. Result: p95 59.33 ms vs 16.7 ms, max 75.94 ms. This is a separate but related stress case around large rich text surfaces during updates.

- Long-history scaling technically passes, but the numbers are not smooth-frame healthy: - 120 turns: total p95 21.35 ms - 500 turns: total p95 23.11 ms - 1000 turns: total p95 36.77 ms

Technically, it is not bad. However, it is a bit slower than my own solution & has similar performance gaps, mostly related to SwiftUI rather than the Textual implementation.