I upgraded to v 7.0.0 a few weeks ago (when it first appeared), and WeChat runs 2 or 3 times slower on my old phone ever since. As for payments, sometimes it takes a few minutes to make a payment in a shop where I scan them. I'm starting to seek out larger shops where they scan me for payments because it's a lot quicker. I really don't want to buy a new phone because my old one still works for everything else. Sounds like WeChat/Huawei is the Chinese version of the old Microsoft/Intel duopoly.
