IMO, if your script only depends on the functionality provided by module A, then only load module A. If your script peeks behind the covers of Module A and loads Module B and Module C from within the script, you have now made your script dependent on modules A, B, and C, and not just A. If you change the implementation of module A to use modules D and E instead, you now have to maintain the script as well.
Only load what you explicitly depend on.
From a persistence standpoint, fastcgi will have the dependencies also loaded.
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