In Internet Explorer, there is a default setting which disables
caching of files and pages which are displayed over a secure connection.
By changing this option, you can reduce the delay it may take to
display the OWA over a secure (HTTPS) connection. You can follow these
steps to enable caching:
In Internet Explorer, from the Tools menu select Internet Options...
Select the Advanced tab.
In the Settings area, scroll down to the Security section and deselect the Do not save encrypted pages to disk option.