How to do caching of certain data to make load faster?

we have Gmail integrated with our app and to display an email we are using appian RichTextEditor. when we open an email we observe three loading bars simultaneously,

1. 1st loads the appian instance on Browser
2. 2nd loads the site inside appian instance
3. and third loads the RichTextEditor Plugin

we want to pre load few objects on Load. How we can preload certain items in appian?