bug#59641: term is very slow

[Akib Azmain Turja]

Term mode is very slow.  On my computer, Coterm is 2-3x faster than
term, and my own terminal emulator, Eat, is 4-5x faster.

I tried to profile Term.  Steps:

1. emacs -Q (+ -nw, environment variable DISPLAY was unset)
2. M-x profiler-start RET cpu+mem RET
3. M-x term
4. Run the following stupid command:
   timeout 1 bash -c 'i=0 ; while true ; do echo $i ; i=$((i+1)) ; done'
   Note I also run emacs -nw in before this command.
5. Wait for finishing.
6. M-x profiler-stop
7. M-x profiler-report

Here are the reports (attached), but don't seem to be human readable:

term-cpu-profile-data
Description: CPU Profile Data

term-memory-profile-data
Description: Memory Profile Data

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