apperyio tester app is terribly slow to load my app

My app is opening very slowly in apperyio tester app (in the magnitude of almost a minute). It seems to correlate with the amount of large images in the mediamanager of the appbuilder. But it opens almost instantly in the browser. Is the app throttled or something in the apperyio tester? The images aren't optimised yet but I'd still like to test the app quickly on different devices. Is it the loading of images in the media manager that is the issue?
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