Are you guys using Objective C/C++ or plain C/C++? If it's an Objective C class, then the method calls are dynamic (that's why it's slower) and thus the method names are stored in the binary.
Use C/C++ and turn off RTTI, then function names won't get to your binaries.
Another suggestion: don't use names like "Info.plist", etc. - scramble the names and keep them scrambled in the binary.
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