I have two imacs.. one is a 27" 2012 model that's upgraded with 16GB ram plus its and i7.  Just got it.. updated to mavericks, and now its SOOOO SLOW on internet.

 

BUT my other 21" imac (next to it) is a 2009 or 2010 model with 3ghz on an i3 processor with 12GB Ram and the internet is perfectly normal speeds.  and it's on mountain lion.  It's so weird. 

 

When I enter the same website, the 27" is about 6 x slower then the 21".  For example.  One website will take about 5 seconds or less to load on 21" imac and the other takes about 50 seconds to 1 minute to load.

 

Both are on the same network.  Didnt have this issue til u updated to mavericks.


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