zcompdump
zcompdump is a cache file used by the Zsh shell's programmable completion system. It stores a compiled representation of the completion definitions available to the shell so that startup and subsequent completions can be performed more quickly. The file is generated and updated by the compinit function as part of Zsh's completion initialization.
Location and scope: By default it is named .zcompdump and placed in the user's home directory (that
Contents and behavior: The file contains a (typically binary) dump of the completion data used by the
Maintenance and usage: If completions behave strangely after installing new software or making changes to completion