If I run your script on my machine (bad) I get:

Counter changes 3579545 times/second
QPC: 35752003971
QPC: 35752004170
QPC: 35752004356
QPC: 35752004527
QPC: 35752004695
QPC: 35752004854
QPC: 35752005017
QPC: 35752005169
QPC: 35752005333
QPC: 35752005487
GToD: 1219149309.90625000
GToD: 1219149309.90625000
GToD: 1219149309.90625000
GToD: 1219149309.90625000
GToD: 1219149309.90625000
GToD: 1219149309.90625000
GToD: 1219149309.90625000
GToD: 1219149309.90625000
GToD: 1219149309.90625000
GToD: 1219149309.90625000
Time: 1219149309.90625000
Time: 1219149309.90625000
Time: 1219149309.90625000
Time: 1219149309.90625000
Time: 1219149309.90625000
Time: 1219149309.90625000
Time: 1219149309.90625000
Time: 1219149309.90625000
Time: 1219149309.90625000
Time: 1219149309.90625000

[download]

And here is the output from a "good" machine:

Counter changes 3579545 times/second
QPC: 76031246430
QPC: 76031246657
QPC: 76031246790
QPC: 76031247127
QPC: 76031247273
QPC: 76031247479
QPC: 76031247686
QPC: 76031247838
QPC: 76031247972
QPC: 76031248165
GToD: 1219150762.25000000
GToD: 1219150762.25004410
GToD: 1219150762.25007610
GToD: 1219150762.25010900
GToD: 1219150762.25013900
GToD: 1219150762.25017500
GToD: 1219150762.25020500
GToD: 1219150762.25024100
GToD: 1219150762.25027490
GToD: 1219150762.25030590
Time: 1219150762.25033810
Time: 1219150762.25036690
Time: 1219150762.25039600
Time: 1219150762.25042800
Time: 1219150762.25047900
Time: 1219150762.25053190
Time: 1219150762.25058200
Time: 1219150762.25063110
Time: 1219150762.25066710
Time: 1219150762.25069900

[download]

In reply to Re^4: Time::HiRes sleep does not always work by tone
in thread Time::HiRes sleep does not always work by tone

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