Years ago, the biggest bottleneck with VTE was that it was storing the scrollback history on disk (https://bugzilla.gnome.org/show_bug.cgi?id=631685). Eventually support for an in-memory scrollback buffer was added, which improved the situation considerably.
Long dumps of output with VTE seems to be fast enough, at least with a barebones program that creates a VTE widget and doesn't do much else. But Gnome Terminal was noticeably slower than my naive program, last time I tried it. I don't know why.
Long dumps of output with VTE seems to be fast enough, at least with a barebones program that creates a VTE widget and doesn't do much else. But Gnome Terminal was noticeably slower than my naive program, last time I tried it. I don't know why.