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Its a problem with shader optimisations EVERY round instead of just once like in BF2. It should only load "slow" once and then be fine after that until you change video settings/drivers. This however isn't the case.
Like I said earlier in the thread, this is the problem.
The 58xx series have an enormous amount of shaders (1600 on the 5870 for example) which is where the delay in loading time is appearing.