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Web application maintainability and performance
Basically, both are unrelated.
It all depend on the programmer, a bad programmer or beginner is likely to score bad in both subjects, a good one or experimented is likely to score good.
The only link is if in name of maintainability you stick to simple and non efficient algorithms, on this case, it is at performance expense
Maintainability should be measured only after you have understood the underlying algorithm.