Loading App Layouts Dynamically

Hi,
In dash i can’t load the app layouts dynamically. I tried loading all the app layouts and try to run the server but it’s taking long time to start the application. because each layout has different set of tables which taking time to fetch data from database. (FYI i configured each layout with different URL with dash URL routing (https://dash.plot.ly/urls)).

I don’t want to fetch whole layouts at the initial stage of running the app server. I would like to know how to run the specific layout once I click on the specific URL?