Casey Johnston for Ars Technica did some more scientific studies on the speed of the Kindle Fire’s Silk browser:
>The internal specs of the Kindle Fire are more than adequate for simple Web browsing, but browsing doesn’t happen with much urgency. To use a popular point of comparison, the Fire loaded pages two to three times slower than the iPad 2, for instance. And the Kindle Fire runs the SunSpider 0.9.1 JavaScript benchmark in around 2,500 milliseconds, much slower than the iPad 2’s 1,700 milliseconds.

Seem about right in my testing and to be honest I really think Silk is faster with the acceleration ‘off’.