I have installed the latest version of 5.1.1.1 and observed the loading of OpenStreetMaps and OpenHumanitarianMap are loading very slow comparatively with 4.9.6.1. Could you please suggest if any changes required to load openstreetmaps.
Although I can’t say for sure what you’re experiencing, there have been changes to the image loading. See MWGIS-5, switching to the cURL library for HTTPS support. However, since then, I also discovered an issue with the threading of the tile loading, although that fix is not yet in a Release build; it is only in the ‘develop’ build.
If you would like, you can try the latest ‘develop’ build (v5.1.2), which is available on Paul Meems Google drive (there is also a link on the blue banner at the top of this screen). See if that makes a difference.