Thread: Garmin 12XX drawing problem

The only issue I see is that the map drawing speed is too slow.

You can try erasing NV ("ergn,41" command in update.txt, read [Only registered and activated users can see links. ]) and formatting the internal flash drive (while making backups, of course. read [Only registered and activated users can see links. ]), and copying back the minimal number of files that are required for the unit firmware to run normally. I guess, the only item you need is the Garmin folder. Everything else should be recreated by the unit firmware.
Thus you would erase most of the unit "life experience".

And then you can install the map of interest and see how it behaves.
If this fixes your issue you can restore the missing files from the backup or by running WebUpdater.

Also what is the target map? Are you building it on your own? Have you checked if this is the map issue by using other maps?