1, mostly chat records (and it is a chat record for a period of time, and the latest chat record will be saved in another folder in QQ, so even if it is deleted directly, it will not have any impact on the use of QQ). If you want to clean up, just find the corresponding files and clean them up. Mobile QQ plus several active groups with more than 1000 people will produce a large number of chat words and pictures every day, which are occupied by memory. Delete what is not needed.

2. The automatic caching function of recently seen photos and videos has not been turned off, resulting in a lot of memory. In addition, there are many thumbnails and various things that need to be cleaned regularly so that the cache will not accumulate.

3. After the above operations, you can "slim down" QQ/ WeChat and clean up most of the junk cache data. After the software is installed and logged in, it will occupy more than 1g of storage space (the necessary space for the software to run). After the data record is restored, it may be two or three G's (depending on the size of the restored record). Compared with the occupation of nearly 10 G before cleaning, the effect is quite obvious. If it has not been cleaned before, then after cleaning up WeChat and QQ, at least 10 G of space will generally be released. If it still doesn't work, then save important data and uninstall and reinstall.