Develop a more aggressive optimization strategy

[antecedent]

• Let the user disable the conservation of file names. If they have caching enabled too, this will let us bypass stream wrappers or filters altogether.
• Perhaps add an optional redefinable-externals: like redefinable-internals, but for user-defined methods. This way we could only inject the interception boilerplate into several methods that are relevant, instead of doing so indiscriminately.