If Get It Done 5 is taking too long to load, please go to the address below to clear out your local cache.
https://app4.getitdoneapp.com/clear.html
If you haven't logged into Get It Done 5 for a while, it can look like it's stuck when you first login because it's trying to sync and resolve every change back down from the server. Clearing the local cache will force the app to download everything straight from the server, instead of trying to resolve and sync.
An alternative is to log out of the app every time you're done with it.
Does Get It Done 5 loads but just operates too slowly? Try purging your completed tasks. See this article on how to do it: How do I delete completed tasks?