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Most of "make it fast" in modern software is fundamentally architectural in nature. If your architecture is not designed for performance or efficiency then no amount of module swapping will make it fast in any kind of absolute sense. And swapping architectures is tantamount to a rewrite.

Most performance has to be intentionally designed in from the beginning if it matters.

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I will say, I don't think I've ever faced a performance issue that was caused by poor architecture. Maybe I've been exceedingly lucky. But pretty much all of the performance issues I've encountered that I can remember are in individual queries or functions / methods (or sometimes, a group of functions / methods); discrete units of code that could be tested, changed, and fixed without any sort of re-architecture or major rewrite. Or maybe we're using different definitions of "architecture" here.

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