While our system aims to get you into the game as fast as possible by only downloading what you need to get started, we also don't want to compromise your gaming experience to do so. This means that for some games there is a larger than usual initial download to make sure that you don't run into any issues.
While the start up size may be larger than for other games, you will still get into the game faster than downloading everything first! Due to the game being downloaded rather than streamed, the second time you start the game it will already be ready to go.
You can recognise which titles have larger starting downloads by the 'hourglass' icon seen on them in the client.