Hi, my question was: how many CPUs/cores (not just CPUs) do you have. Even if you have only one (e.g. Intel) CPU, but with, say, five cores, your process might very well take more or less 100% of one core's processing power but still leave the 4 other cores almost completely idle. Since you are not forking subprocesses in your program nor using any threads, your process can basically only use one core (the system itself might be able to delegate a small fraction of its own work to another core, but this is likely to be very limited). So you might very well use 100% of one core's processing power, but only 20 or 25% of the CPU total processing power.
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