Why commands used with sudo takes time to execute?

Issue

• If a command is used with sudo (for e.g. sudo yum clean all) it takes time to execute.

[21:29][test@server4 ~]$ sudo yum clean all
[sudo] password for test@server4.example.com:
Loaded plugins: package_upload, product-id, search-disabled-repos, subscription-manager
Cleaning repos: production-rhel-x86_64-workstation-7.4 rhel-7-server-rpms 
Cleaning up everything
Maybe you want: rm -rf /var/cache/yum, to also free up space taken by orphaned data from disabled or removed repos
[21:33][test@server4 ~]$ 

• In the above output it's taking about 4 minutes for the command to execute completely.