Q:xposed hook all methods of an app and the impact of the performance

I developed a module to monitor the performance of an app (for example: wechat , whatsapp, any app is ok), my motivation is to get the delay of all the methods of the app. So first I get all the classes list and save as a txt file in sdcard, then in my module I read the class name one by one and get declaredmethods and hook every method of the class.
Actually this module successed, but the app (wechat app) crashed (NO RESPONSE) , the app is very complicated and the large amount of classes,methods hook impact the app's normal running.
Q: I want to know tracking and hooking all methods of an app is possible? HOW TO FIX THIS PROBLEM THAT THE APP DO NOT RESPONSE?