I'm the same. It freezes all the time. I can only reply to threads sometimes (clearly I am replying to this one! ) because most of the time the blue bar disappears from along the bottom so there is no 'reply' option.
I can't hi-light posts, so I'm finding it hard to find my own posts etc
I can't flip threads, so unless a thread has got less than about ten posts I can't read it from the start, because if I try to scroll back to the start (mine was set up with newest posts at the top) the screen just freezes.
I don't mind the font and brightness etc, I think that's something that I will just get used to.
But it's just unusable. Not difficult to get used to the changes but actually unusable. I used to use the mobile site because the app was so awful, with all the hundreds of sticky posts, and the fact that you could be reading a thread and there would be big chunks of missing posts.
So the app is unusable, and the mobile site was fine but has now been made unusable. Why would any business do that to themselves? Why would you go out of your way to make it difficult for people to use your site?