Freedome VPN is very slow on some connections and not other
I use Freedome in travel, over a wifi hotspot. Without Freedome enabled, the wifi connection is respectable. With Freemdome enabled though, the connection is unpracticable (very very slow, some http resources like images or css not downloaded, etc.).
At the exact same place, I tried freedome (same VPN location) with a 4G connection shared in wifi on my iphone. The connexion is normal (not slow).
What can explain that difference and above all what can I do to use Freedome on the wifi hotspot ?
I suspect a bad behavior / parameter from freedome because the wifi connection alone seems to be pretty good.
UPDATE: after a connection speed test, it seems the wifi connection is acceptable for downloads but very slow for uploads. I suppose freedome need a good upload speed for use...