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Google Analytics is a great tool, but every web server keeps complete access logs. Additional page tracking is not necessary, and is needless overhead on page load times. The reason why it might slow down loading a page, is because you have to load the Google script first, then the rest of the content. If you have javascript turned off, you might also have inaccurate stats, also the most popular Firefox addons or Opera filters, which block ads, block google analytics services as well, so you might miss some visitors again.
Using AwStats or other tools, which are based on server logs are absolutely enough for me.
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