I've noticed the same thing, and on macOS, too. Non-free operating systems have a really poor selection of terminal emulator software, both in terms of feature

I've noticed the same thing, and on macOS, too. Non-free operating systems have a really poor selection of terminal emulator software, both in terms of feature sets and in terms of performance. They're usually inflexible (Microsoft's old terminal emulator, like for PowerShell and CMD by default) or extensible but based on web technologies, and in both cases, they're slow. iTerm2 can be made to perform passably, but only by throwing GPU acceleration at the problem, which doesn't seem to be necessary for popular and banal terminal emulator choices on Linux, like Gnome Terminal and Konsole. The performance differences become much more visible if you're a tmux user, in many cases.