This is an obscure trick that indirectly reduces XML download frequency.

Why this works: Google Play Services spawns a background process specifically for fetching remote config (often called GmsConfig). Limiting background processes forces Android to kill this fetcher regularly. XML downloads then occur only when you open an app that forces Play Services to restart.

Downside: Your launcher may redraw frequently, and widgets may freeze.

After applying any method above, monitor your device for 24 hours.

Signs of success:

Signs you over-blocked:

This method blocks only the network access for the XML download process without crippling Play Services entirely.