There isn’t a way to “wait until loaded”, as far as I know, but there is a way to “preload next page(s)”
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If you want to only preload one or some particular pages, have a look to the article I wrote about the solution we found with @AaronSterling
https://medium.com/@david.dalbusco/preloading-modules-in-ionic-v4-1839c34384fb -
If you rather like to preload everything, Angular offers a preloading strategy which could be added to
app.module(which btw. I never tried yet) https://angular.io/api/router/PreloadingStrategy
P.S.: Link to the related topic on the forum V4 preloadModules?