Hi Austin,
thanks for the detailed information. The links between Agilo tickets are stored in a database table called 'agilo_link'.
What exactly did you observe in the tickets link logic that slows down the loading of the backlog?
Also, one thing you could try, if you didn't already, is making sure that the slowness is pertinent to the backend and not the network. One way could be using Chrome's Developer Tools to have a break-down of the request's times.
If you do that, can you please share the results?
Also, have you already enabled the Agilo logs? If not, please do so and send them to us so we can have additional information.
Lastly, if you have any additional third party plugins, please try and disable them, so we can exclude the hypothesis of a possible bad interaction case among plugins.
Thanks,
Stefano Rago