Hi,
Im using iGo Primo 2 (9.6.5.211211) and it little bit laggy during navigation.
How to solve tis laggy issue ?

Laggy like slow?
What exactly is slow? The voice too late? Your position on the road is far behind the real position?

This could mean your device must work hard but the processor can't cope or the memory is overloaded with features.
Loose all unneeded eye candy (like 3D), no DEM file, no TTS, ...
Or you could use iGO8.3.5 which is less demanding.