If you're facing a blank screen upon opening the app, this issue is likely related to your phone's caching. Uninstalling and then reinstalling the app should resolve this.
The app's performance also depends on your device's condition, such as available storage and software updates. Since HMUAs often have many photos stored, checking your phone's storage capacity and ensuring it has the latest software updates can also help improve app functionality.
Unfortunately all these factors are outside our control and are dependant on your phone. To resolve this:
Try clearing your browser's cache (Google how to clear cache for Safari or your specific internet browser)
Free up some storage on your device
Check for any pending software updates and install them.
These steps can help improve the app's performance on your device.