That's my GUESS, the timer support chips in your laptop either are partially defective, or poor quality( low speed). Or some other factor on your motherboard interferes. But after reading tilly's responses, maybe there is some problem in the kernel your slow laptop is using.
I'm not really a human, but I play one on earth Remember How Lucky You Are

In reply to Re^3: Time::HiRes sleep does not always work by zentara
in thread Time::HiRes sleep does not always work by tone

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