Yes... that's true. If you even scope the variables from the variables scope (EXCEPT in components, since they have their own variables scope) CF is around 4 times slower than addressing a variable from there without the prefix "variables". But this execution isn't very significant when your website is quite slow. It is 4 times faster not to scope variables from the variables scope, but in reality you won't notice that much improvement since accessing variables in comparison to querying a database is really a matter of order of magnitudes (So maybe "variables.whatever" executes in 12 nano seconds, where as "whatever" executes in 3 nano seconds, whereas a query will take 1ms which is 1000 nano seconds).
In Railo you can enable a setting that actually forces you to scope your variables from the various scopes. So for instance if you do something like this: <cfoutput>#id#</cfoutput> and ID is in the URL scope Railo will complain that it doesn't know the variable ID (if this setting is turned on) and throw an error. So you HAVE TO write it like this: <cfoutput>#url.id#</cfoutput> Then Railo processes the page without error. Once you have scoped all your variables the system will be somewhat faster. Just imagine it like this: You are searching for a Peter (a variable) in a school (CF memory). You enter every classroom (scope) and check whether a pupil named "Peter" is sitting in it. If you find it, thats your variable. But if you know that Peter is sitting in the classroom number 55 then you go directly there and look for Peter. With the scope cascading disabled, Railo will not allow you to look for a "Peter" in the school without the classroom number. Hope that helps a little. Greetings from Switzerland Gert Franz Railo Technologies Professional Open Source skype: gert.franz g...@getrailo.com +41 76 5680 231 www.getrailo.com -----Ursprüngliche Nachricht----- Von: Charlie Griefer [mailto:charlie.grie...@gmail.com] Gesendet: Donnerstag, 10. Dezember 2009 16:59 An: cf-talk Betreff: Re: scoping and speed In theory, yes, as ColdFusion will have to hunt through the various scopes to find the exact variable that you're referencing. Whether it's noticeable or not.. hard to say. >From the CF8 docs ( http://livedocs.adobe.com/coldfusion/8/htmldocs/help.html?content=Variables_ 32.html ): "Because ColdFusion must search for variables when you do not specify the scope, you can improve performance by specifying the scope for all variables." I do actually recall hearing that on Railo, it was faster to -not- scope local variables. Not sure if that still holds true or not. On Thu, Dec 10, 2009 at 7:13 AM, Chad Gray <cg...@careyweb.com> wrote: > > If you don't scope your local variables does the page run slower? > > IE. #variables.foo# vs. #foo# > > > ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~| Want to reach the ColdFusion community with something they want? Let them know on the House of Fusion mailing lists Archive: http://www.houseoffusion.com/groups/cf-talk/message.cfm/messageid:329053 Subscription: http://www.houseoffusion.com/groups/cf-talk/subscribe.cfm Unsubscribe: http://www.houseoffusion.com/cf_lists/unsubscribe.cfm?user=89.70.4
