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Possibly, but if you are processing live market data, you are in the arena of almost hard real-time systems. I.e. you effectively have a time budget to process every single tick/message. Then, even low-level optimization can make a large difference. E.g. if you can make some helper method use less memory, i.e. it uses less of your caches, that can make a big difference on your business logic. Amdahl's law is not at all suited to understand such non-linear non-local inter-dependencies.