Mac updating boot caches
As mentioned multiple times, it is not necessary nor is it recommended to manually remove and clean caches yourself like this, unless you have a specific reason to do so, typically for troubleshooting.The above method covers deleting and cleaning out caches and temporary files from the active user account, but the Mac system software and system level apps can also create temporary files and cache files.
The hidden system caches are mainly created by the apps that run on your Mac.
It takes some time and patience, but if you follow our instructions, you can get the job done all by yourself. Deselect everything but System Cache Files and User Cache Files, then click Clean.
Your Mac’s DNS cache is a list of all the DNS queries that were resolved for every site.
Be careful: not all app cache files can be safely deleted.
Some app developers keep important information on cache folders.