Problem solved.

The culprit was IDLEHALT=1 in fdconfig.sys. After removing it,
Desi-III refreshes the screen under FreeDOS very fast,
apparently just as fast as under MS-DOS.

Here's a summary of the refresh times under FreeDOS (for a given
drawing I used for testing):

  With IDLEHALT=1 and FDAPM APMDOS        11   sec
  With IDLEHALT=1                          5.5 sec
  Removing both                            0.4 sec (estimate)

Nothing else had to be changed in FDCONFIG.SYS and FDAUTO.BAT.

Thanks, and a happy new year!


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