Today, checked again,
this time alone on my bike on straight road, no funny business. and result was following
Bike Meter 106Km/h and Mobile GPS 87Km/h.
@Automotorsport
Last time i touched 110Km/h only for a moment and GPS noted 90Km/h, and today i was on 106Km/h for quite a few seconds and it noted 87Km/h, i guess that confirms that it records in real time. 
