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Improve performance when typing passwords

Administrator requested to merge perf_tweaks into master

This MR has the following changes that improve performance for me:

  1. implement a more efficient algorithm for drawing filled circles

  2. reduce keyboard repeat delay from 100ms --> 25ms

  3. draw 3 times when using hw accel, since some drivers appear to triple buffer and skip frames on the screen

Measurements from gprof in the first commit in this MR: !98 (diffs)

Fix #103 (closed)

Edited by Administrator

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