>It takes multiple seconds to launch,

Yes, this is the ubiquitous memory issue that I mentioned. Unfortunately, it is now the baseline in all modern apps.

>random lines disappear in the scroll back, it’s internal state gets messed up causing the TUI to show duplicate and/or offset lines,

I haven't seen this issue, other than when I am using a shell that is bugged and does it with all TUI/console programs (usually a virtualized shell which I resized). Do you have a reproducible example of this?

Baseline for “modern” apps, what? We’re talking about a terminal application here, there is definitely, most-assuredly ways to write something that does exactly what Claude Code does with a teeny fraction of the resource requirements.

The trick is not bringing React into the terminal.

(FWIW, I have a link to a TUI harness in my profile that uses 50MB of ram and about 1% CPU while streaming, even in giant contexts)