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Only do this on large maps and only if you totally understand vis...this isn't a way to reduce vis times, it's a way to reduce vis data, reduced vis times is merely a side effect.
in the worldspawn (select a regular brush and hit n) enter a key of _blocksize and a value of 3 numbers, e.g. 2048 2048 2048. Search the forums as I am sure I'm repeating myself here.
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