Adding
tty->wrap_mode(Fl_Simple_Terminal::WRAP_NONE, 0);
after line #2069 of file test/tree.cxx (after it was generated by fluid),
has the slowness disappear.

Thus, the slowness seems connected to computations that support line wrapping
repeated each time a line is written to the terminal. And, this gives at least a
temporary fix for the issue.

Still, it's very strange that the same Simple-Terminal code is fast under 1.3,
since wrap support is presumably the same as in 1.4.

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