You can only ctrl+o the most recent response, and its a lot worse than knowing the # of lines read or the pattern grepped, which are useful because it can tell you what the agent is thrashing on trying to find, or what context would be useful to give it upfront in the future.
I mean yes, they claim that it's "Claude Code Native" or something but it does feel laggy and takes multiple seconds to start. What do they even mean native, didn't they acquire Bun? It's not native. They need to rewrite it in Rust, I'm serious.
Codex feels much faster. For a while after the rewrite (to rust also I think?) it was bad because you couldn't copy anything from the terminal but since then it's gotten much much better.