Because TFC worldgen doesn't change very many blocks when decorating the world in comparison to vanilla (I know right!?), the networking engine chooses to use a different packet than just sending the entire chunk to the client. This seems to trigger a massive number of lighting updates and devolves into a giant mess of lag for a few seconds.
There is also a whole host of other fixes and tweaks, so I recommend that you head over to the changelog page to see what all has been affected.
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