I've tried various different TomTom GO models with different Navcores and find on all normal roads or simple junctions the display can keep pace. On multi junctions of complex roundabouts I find the few seconds of lag in display can lead me to take the wrong turn. Have others members experience this and is there a solution. Are newer models the same?

which navcore you used?
im used GO 720; and still using GO 520 i never got any problem with lagging.
post your navcore and map version.

Also your car vould be the problem. Some cars have tinted windshield which cause bad reception.

Check your GPS status menu if you have enough blue beams and if they reach to the top. Cause bad reception can also cause GPS lag.