[jboss-dev-forums] [Design of Messaging on JBoss (Messaging/JBoss)] - Re: Optimisations: A couple of low hanging fruits going for

[david.lloyd@jboss.com]

UTF-8 is a little more complex than that.  Chars 0-0x7F are represented by one byte, 0-0x7F.  Beyond that characters are represented with 2 to 4 bytes.  This means that for every character there are multiple comparisons and shifts performed, with some extra bits being set or cleared for certain characters.

UTF-16 on the other hand, being the native encoding for Java, is written one char at a time without transcoding - no shifts, no comparisons, no bitmasks.  It's just a straight write of chars.  You can't possibly do better than that in terms of processing speed.

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