I have been using Maaloo Geocaching 2.8.2.0 on a Lumia 950 XL for a few days and notice slow map updates.
On my previous phone and on my wifes phone (Lumia 920), map updates happen each second, but on Lumia 950 XL it takes between 5 and 7 Seconds between each map update. The GPS accuracy is also never around 2-3 meters as it is on the older phone, but instead around 20-80 meters. Other applications, like the inbuilt map application from Here/Microsft does have fast map updates.
Otherwise it is working very good on 950 XL. And the new 2.8.2.0 version is nice with icon status remembered between each session
