2. Cahce and Cachenew folders under data files mainly affect the fluctuation of client size, and the above two files are cache files.
Cache folders fluctuate with the game experience, so the file size is not fixed. Generally, the cache folder is around 0-9G (for reference only).
Caching files can appropriately reduce hard disk reading and writing and prolong hard disk life. Under normal circumstances, we don't recommend you to do the above two folders! Work (except for update failure or game error caused by caching files).
3. A clean client root directory can refer to /support/article.xml? Figure 2 in regional setting = zh _ cn & articleid = 32130.