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From: Nigel Wade <nmw@ion.le.ac.uk>
Newsgroups: comp.lang.java.programmer
Subject: Re: VERY PECULIAR PROBLEM
Date: Fri, 13 Mar 2015 09:36:48 +0000
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My guess, and it has to be a guess because of the total lack of information as others have highlighted, is that your 
code (the *other* code, which you don't show) "doesn't count time" because it's running in another thread which isn't 
synchronized properly. The code you've shown is a tight, CPU bound, loop so I guess the other thread is starved of CPU 
cycles. Add your System.out and the tight loop becomes I/O bound, allowing the other thread to gain CPU cycles.

All complete conjecture based on a complete lack of information.