What it's more likely to happen is what gets to be optimized. If something doesn't happen often, it will be slow. This is what JITs do too. DOS attacks have nothing to do with this because they don't affect correctness of the code.
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I'm not sure I'm understanding this correctly... wrapping a result in Either adds a cost (potentially optimised) to every single successful case. Throwing an exception adds a larger cost to every single failure.
we cannot discuss these topics under such conditionals
But if those exceptions are terminal, or at least short-circuiting in some way, it seems (assuming the JSON example) like it would be impossible to have enough exceptions thrown in a DOS attack to outweigh the penalty of the additional allocations for Either.
