Post by @Firesphere@cloudisland.nz

2026-09-22 23:27 UTC

Hmmm, the #TSB app takes multiple minutes to load when I'm on my home #wifi, but on the mobile network, it takes seconds... Seems fishy, my gut feeling is there's a heapload of tracking attempting to load before the actual log-in and fetch data actions are taken.

Replies (2)

@dubh@cloudisland.nz 2026-09-22 23:38

@Firesphere@cloudisland.nz if you can trust them, the Adguard mobile app uses a local VPN to log (and potentially block) all dns requests by an app. Quite handy in figuring out what apps are doing. Charles (possibly iOS only) logs connections too, also handy and possibly easier to trust. But you probably already have something in your router I’m guessing.

Open ##4811067
@monniele@infosec.exchange 2026-09-27 08:02

The latency difference likely stems from the app attempting to resolve a large number of third-party tracking domains over your local Wi-Fi, which often lacks the DNS hardening or QUIC optimizations present on mobile networks. This behavior confirms that the application performs extensive, unauthenticated network calls before reaching the authentication flow, effectively fingerprinting your device via the resolution of these external endpoints.

Open ##5179343