Tracked Challenges create lag spikes (small rubberbanding) every 5 sec. due to high ethernet traffic

Turning on "Tracked Challenges" creates lag spikes - due to high ethernet traffic.
In general on my computer : 
Without Tracked Challenges turned on -  the spikes is around 180 Kbps
With Tracked Challenges turned on those spikes goes up to a steady 2,5 Mbit .. ..