I have this too, and it has tripled my map loading time. I used to be the first one in the game pre-launch, and now I usually don't get until until after the game has started and half the server has chosen sides. For me the pre-caching seems to happen in an exponential fashion, where the first hundred or so takes 10-20 secs, and the last 800 take the same another 10-20 sec.
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Just that subsequent preaches are much faster.
I have that Precaches problem too
He means that after the 1st time he loads a map and precaches, all the next maps to load during his gaming session precache faster than the 1st time.