I can say that the memory card that I use is 32 GB and it works fine, doesn't have lag. The signs appear on time but black and white at the beginning and it turns coloured too late.
I'm using this device since 2012 and I changed the maps several times and always the signs appears a little bit late. Actually, the signs appear on time but at the beginning are black and white. It will be grate if we could find a solution to make it appear sooner. I think it should be a setting or at least to make it coloured from the beginning...
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