I noticed this lag behaviour of Sygic on my N97 too. It renders the navigational skills of this device to zero. I blamed the underpowered hardware and the bad N97 GPS antenna for it. Hopefully this is not the case with N900. I agree with you, Sygic on N95 works flawlessly.

Since i rule out the poor hardware (whats the cpu consumption when using Sycig?), maybe N900 gps is also too weak or reacts too slow?

The position often jumps around on Sygic/N97, wanting me to turn around on the highway , just to see that my position is fixed on the city streets next to the highway. Can you confirm such behaviour on N900 ?

ein_guter