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External libraries usually have to cater to wider usage and thus have more code and more parts and more options. A "dedicated" in-house module will typically be much less code because it has one job, meaning less to read, reverse engineer, test, etc. I'm not saying one is always better than the other, only that one brings in a rather complex wad of code in most external libraries that could be a bottleneck.

The "community" often ignores my bug fix requests, I would note. Maybe I ask wrong, but we don't all have wonderful asking skills. If you do, that's a nice feature of your personality, but doesn't necessarily extrapolate to all code users.