What is wrong with their pace? It isn't how you do things but isn't that because it is their relationship? It sounds like you are confused by this and I would be too probably, but it is their relationship and their way of doing things... if your gf is okay with it all then its all good no?
If you want them to get the sex part over with because you want to hurry up and deal with it, it looks like you are going to have to respectfully wait. You wouldn't want them to rush because of you would you....? really?
Maybe she should stop talking about what they do so much and let you know when she thinks the sex might happen in order for you to prepare. Perhaps by then it will be more of a "oh thank god" thing rather than a "okay, lets deal thing" not all bad I think?
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