once its up and running it only uses about 2-3 Mbps. Make sure you have rolling cache configured and switch photogrammetry off. It should work well when not at busy airports / cities.
With. 10 mbps connection you will be limited. I’d also switch off the live AI traffic.
Remember the first time you fly over an area it will be cached in the rolling cache. After that, if you fly in the same area the images will be loaded from the cache and not the internet.