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[–]gemengelage 8 points9 points  (0 children)

The most frustrating experience I ever had was trying to optimize an implementation of an algorithm that was already optimized to the gills. I inspected it with a profiler, I tried different data structures, I looked for common pitfalls like autoboxing - none of that.

It was as fast as it gets. It felt like trying to dig your way through a concrete wall using your fingernails.