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Re:“Clean” Code, Horrible Performance by osigurdson on Tuesday February 28, 2023 @08:53PM (#34977757)
>> Lack of concurrency/parallelism

Definitely get the single-threaded house in order before attempting to speed up by running in parallel.

Re:“Clean” Code, Horrible Performance by yxhuvud on Wednesday March 01, 2023 @10:47AM (#34983584)
Depends. For example, if the slowness comes from sequentially emitting a lot of http requests, a lot of performance can be gotten from doing it concurrently.