Only have the map enabled that you are using. Having multiple maps enabled seems to make redrawing of the screen much slower.
Ah ok. Makes sense. I think I've just got the map I downloaded from OS (Entire UK) and the crap one that came installed on the Garmin. I'll check and disable anything but the OS one I want. Cheers.
@Itisaboutthebike started
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Only have the map enabled that you are using. Having multiple maps enabled seems to make redrawing of the screen much slower.