Most profiles won't even load (user not found) and the app takes minutes to load anything. However, the 30 second unskippable ads always load within half a second.
It's not even a game, yet the developers managed to screw it up with ad spam.
The website works better anyway, so there is now zero reason to use the app. An additional item to the punch list: the website loads player profiles almost instantly, while the app drains my battery and is still slow.
I really miss the old Rainbow Six: Siege days where the stats were in the game itself, without some third party app...