Here are some self-help steps you can try to optimize the loading speed of your site:
Check your speed between each one.
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)
Remove the extra versions? -->system & settings --> Optimization --> Automated Jobs --> Remove Old Page Versions.
Clear the error log: Go to dashboard-->reports-->logs. Click the green button and save the CSV export to save and send to us.
Then delete all.