I've got a TT 720, which has the official navcore (8.398), but the navcore has been patched as i also have put the new 870.3406 UK & ROI maps.
Anyway, my TT seems to lag when driving. By the time it shows me a street, i've already driven past it. I was told to check and do the following:-
1. Switch off any POIs - I've turned off all POIs
2. RAM - I have 15.9mb ram free
3. Clear Flash - I've cleared it three times, although i'm not sure if its supposed to wipe out all the data on the TT as its still present. Also when i install the clear flash tool, it seems to only take a second or two and reboots the TT and then says installation complete.
4. Update the TT via HOME for GPS fix update - Done.
Still no luck, so what else can you guys recommend?
This has nothing to do with performance issues I think. I've had this problem also, and suddenly the problem was gone. Maybe it helps to just reinstall the NC and/or the map, I don't know. For some strange reason, the problem was solved for me automatically.