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Not necessarily. Zed is designed to be very fast. Worth looking into. https://zed.dev/

Both VS Code and Zed have pretty comprehensive (and in the case of VS Code, widely used) Vim modes, so it would really be quite a lot like that.

+1 for Zed [running in vim mode]. It has best-in-class tree-sitter and LSP support (not unsurprising since Max Brunsfeld of tree-sitter fame is one of the founders).

Arguably native drawing should be faster than going through terminal subsystem, all other things being equal.

if anything GUI's should be significantly faster (well, I say significantly, but a well optimized GUI app and a well optimized Terminal + TUI app would probably have near imperceptible latency today anyways)