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Jeremy said:server load is the biggest reason. When you have larger sites with sometimes 100+ online at a time, and you have all of those people refreshing the who's online box with every page they load, it can really slow things down

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really?
intresting, my site has quite a few people online most of the time, (70+ on my 15min window) so if I up this to say 30 mins, it'll reduce my load?
Will try this out!
Are there any figures of how increasing the time affects load?