I’m planning to download the mobile app onto my old smartphone running Android 8.0 so I don’t have to keep using the mobile browser. For anyone who has installed the APK on a device with older hardware and limited RAM: how snappy is the app, does it crash during live betting, and how much storage space does it take up after installation?

Don't worry about performance on budget phones; just download the APK from https://gsb-tz.com/app/ . As far as I recall, the file is only 3 MB and runs smoothly on Android 5.0 and up. The app doesn't crash during live betting and updates odds quickly, even with a weak internet connection. Install it, seize the moment, and may luck be on your side!