I've had my Xiaomi MAX 2, an 2017 model with Snapdragon 625 and Android 7.11, for a while now. I find it very slow lately. I found old versions of WeChat, TikTok, and Alipay from around 2022 on the豌豆荚 app. It seems that the new version of Android is causing the lag. If I switch to earlier versions, they seem fine.