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Google search takes up 50% CPU load on Firefox

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Every time I try typing in a search query on Google, FIrefox's CPU load suddenly jumps to 50%. It started when I updated to Firefox 16. It happens when I type search queries on Google.com and on their search results. What happens is when I start typing something it lists down possible search queries and that's when it slows down. After it though it works normal. It doesn't happen on Yahoo or Bing. Just Google. I tried disabling all add-ons and my anti-virus, but it still happens. Any clue what might be causing this? Thanks.

Every time I try typing in a search query on Google, FIrefox's CPU load suddenly jumps to 50%. It started when I updated to Firefox 16. It happens when I type search queries on Google.com and on their search results. What happens is when I start typing something it lists down possible search queries and that's when it slows down. After it though it works normal. It doesn't happen on Yahoo or Bing. Just Google. I tried disabling all add-ons and my anti-virus, but it still happens. Any clue what might be causing this? Thanks.

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Follow up info: It's Google's Autocomplete feature that's causing the slowdown. Firefox's CPU load jumps to 50% when Autocomplete kicks in.