Here are some self-help steps you can try to optimize the loading speed of your site:
Clear the site cache
Dashboard-->System & Settings-->Optimization -->Clear Cache
This is probably the most important button on the site. Use it often.
Empty the trash
Site map --> show hidden pages. Click on Trash, select Empty.
Remove the extra versions
System & settings --> Optimization --> Automated Jobs --> Remove Old Page Versions.
Remember, you can't have your versions and clear them, too. You will not be able to revert your pages past the last time you did this.
Rescan all files
System & settings --> Optimization --> Automated Jobs --> Remove Old Page Versions.
Clear the error log
Dashboard--> Reports--> Logs. Click the green button and save the CSV export. Send it to the CMS Manager at IMCOM HQ. Then delete all.