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I use both awstats from my CPanel and Google Analytics. Numbers will always be "off" between differing web analytics software because they use different metrics for their stats. Some will count bots while others will not, they consider sessions to be different lengths, uniques differently and some of this stuff is changeable within the software configuration.
As for uniques - some will count by IP but there can be several users coming from the same IP address. Some software will try to mask some sort of signature per user to try to make the uniques more accurate by combining IP, browser, browser version, OS, and whatever other data they can collect about the user to try to make them look more unique then an IP address that might be used for several users. Because of how stupidly they setup a network where I used to work (stripping client IPs), we had two users in our web analytics software - outside the network and inside the network depending on which side of the router you were accessing the web server from.
As for it slowing down during page loads, yes, that happens which is why people recommend placing the code at the bottom of the page so it's the last thing loaded and doesn't slow down the page itself loading.
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