Not entirely correct, nor entirely wrong. Bit of both.
If you want to see exactly what is happening with the game when you are playing, create an Adobe account, download Scout, run it against the game while playing (preferrably on a second screen) and watch what happens when you play.
This game doesn't load assets to your machine, it loads them to your browser cache, there's a difference.
The meter (game client) does not close it's connection state to the game server upon releasing the mouse button waiting for the meter to track and you press the button again to stop it. That connection stays open always, game would be unplayable otherwise.
Your own connections, ISP, internal network traffic, PC connections from other applications which 'sqwak' back to servers, AV software... Those connections and traffic can and certainly do cause meter skips etc.
It's not WGT sabotaging the servers or game.