Generating XML dynamically VS generating xml file

[spiderpg]

I have to load some XML data (generated from a database, using PHP) into a flash slideshow. The database data will change only when someone edit the website at it's backend.In terms of loading speed and performance, which is best:1) Generate the XML data dynamically from the database, each time the page is loaded;2) Generate a .XML file whenever the database is updated, which will be read by the flash file.