Personally I have not heard of ANY valid argument why you should turn off friendly URL;s.  That is unless you are using a third party Friendly URLs component.

I am using friendly URLs on my sites and have not had ANY problems with it at all.  I would guess there is some performance implications using friendly URL's but I have not seen any number on it.  I also know that the DotNetNuke.com website has it turned on and runs a large amount of traffic on 1 server (so I have heard) and well if it is working this well I don't necessarily believe there is true reasonings for turning it off.

If you turn off frienldy URLs you then have major SEO issues to worry about as well.

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-Mitchel Sellers
Microsoft MVP, ASPInsider, DNN MVP
CEO/Director of Development - IowaComputerGurus Inc.


Visit mitchelsellers.com for my mostly DNN Blog and support forum.

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Everything in life is a tradeoff.  ASP.NET has to be processed by the server and is slower than HTML.  Chocolate tastes good but makes you fatter.  Friendly URL's take longer to process than not using them.

The questions whether the tradeoff is worth it to you in this specific case.  The simplest way to find out is to test.  In most cases, the extremely minimal processing time won't be an issue.  Even if it were, there are likely other efficiency improvements you could make that would be a better use of resources.

Jeff