Hello there,
You can try following things:
-Clear tomcat cache.
-In CMC Homepage==>Preferences, check the number of objects per page and set it to 50 if it is set to a higher value.
-Check value of "Auditing events in the queue" in CMS metrics. If it is too high, you might need to clear "Auditing" folder in the installation directory.
-In case you are using any third party authentication like Windows AD or LDAP etc. then you can check if the plugin schedule frequency is not too less like every hour. Set it to run after every 12 hours.
Regards,
Kapil