Quote Originally Posted by enetilah View Post
I am asking because in simulation mode nuvi screen gets dark and nuvi speed gets slow
The reason for screen gets dark is night time for Europe to opposite daylight in your location probably!
JCV does not reduce speed of device because it is point features and be reading only on junctions. If you Nuvi gets slow you can try to serve the internal memory - check for errors plus defrag and optimize also. Be careful!