donkey 1.9.1 — a third of the work between your keystrokes

Nothing you press behaves differently. DONKEY now does about a
third of the work between your keystrokes that it did in 1.9.0, and
the README says how to byte-compile a copy you cloned yourself,
which is worth another ninefold.

Under the hood

• The cursor update after every command asks first whether anything
  it reads has moved -- the buffer, the selected window, the state's
  cursor setting, and the cursor-type another package may have set
  -- and returns when nothing has. It cost two microseconds a
  command in a graphical frame and now costs one.
• The position ring reuses the marker it drops instead of making a
  new one and copying the list. Recording a move cost 5.8
  microseconds at the default ring size and 21.6 at a hundred; it now
  costs 3.6 and 3.9, and no longer grows with
  donkey-position-ring-max.
• The C-g interception in Insert state asks whether the key was
  C-g before asking what the buffer's mode is, which is the same
  question in a cheaper order: 1.7 microseconds a keystroke down to
  0.3.
• Together: everything DONKEY does between two keystrokes fell from
  8.7 microseconds to 6.5 read from source, and from 3.1 to 1.0
  byte-compiled. A test now recounts the five functions DONKEY puts
  on the command hooks, so a sixth is a deliberate decision about
  what a keystroke costs.
• The README's Installation section gains "Byte-compiling a manual
  install": the plain load and the use-package clone both run the
  interpreted source, where every DONKEY function costs about nine
  times what the compiled one does. straight.el, quelpa and any
  package archive compile it for you; a clone does not. The section
  gives a form that rebuilds when the source is newer and never loads
  a stale compiled file, and says to keep a symlink rather than a
  hard link when tracking the repository.

Upgrading

Nothing to do. Every key does exactly what it did in 1.9.0, in a
terminal and in a graphical frame, which is what the tests and the
live runs in both were checking.