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    <p><strong>Big Fat Disclaimer</strong>: this is not really an answer (maybe). I don't know about this topic beyond what I've read. I'd rather post this as a comment, but the size limitation and formatting features makes an answer a better, constructive, alternative. I don't understand this subject enough to answer, and I'm helping the research only.</p> <p>On the <a href="http://developer.android.com/guide/practices/design/performance.html#foreach" rel="nofollow noreferrer">Android dev guide</a>:</p> <blockquote> <p><strong>With an ArrayList, a hand-written counted loop is about 3x faster</strong> (with or without JIT), but for other collections the enhanced for loop syntax will be exactly equivalent to explicit iterator usage.</p> </blockquote> <p><a href="https://stackoverflow.com/questions/716597/array-or-list-in-java-which-is-faster/717205#717205">Here</a>, a user benchmarked a for-each loop:</p> <blockquote> <p>n.b. I did notice that using for String s: stringsList was about 50% slower than using an old-style for-loop to access the list. Go figure... Here's the two functions I timed; the array and list were filled with 5000 random (different) strings.</p> </blockquote> <p>Below, another user warns about benchmarks. Personally, I doubt the use of a for loop would create such a problem on your code, as I've been wary of micro-benchmarking in Java. For what I've seen, it all boils down to microseconds of the Iterator object running. I believe you're doing something wrong, as just because you removed the enhanced for and it performed better doesn't imply that the enhanced for itself is slow or bad.</p> <p><a href="https://stackoverflow.com/questions/6839494/enhanced-for-loop-performance-worse-than-traditional-indexed-lookup">On another topic</a>:</p> <blockquote> <p><strong>TL;DR</strong>: enhanced loops are indeed slower than a traditional index-based loop over an arraylist; but for most applications the difference should be negligible.</p> </blockquote> <p><a href="http://today.java.net/article/2006/11/03/nuances-java-50-each-loop" rel="nofollow noreferrer">See a doc</a> about the enhanced for loop. You shouldn't be changing the list at will while in the loop. If that relates to your problem, I don't know. Perhaps maybe if I see the code and log lines.</p> <p>So, I'd guess you're doing something wrong on your code. :-) But it would be better to wait until experienced people come up here.</p>
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