Thanks for asking.
I checked the website and ran a speed test on Pingdom. The average load time comes around 6.17 secs. I would suggest you to take a look at our performance optimization guide to speed up the load time.
Regarding Cornerstone running slow, I suggest you to try out following solutions:
- Test for a plugin conflict. You can do this by deactivating all third-party plugins, and see if the problem remains. If it's fixed, you'll know a plugin caused the problem, and you can narrow down which one by reactivating them one at a time.
- Increase the PHP Memory Limit of your server. Click here for more detailed information and how to increase the PHP memory limit.
Let us know how it goes.