Does anybody know if there's some performance improvement to be released within JDK7?
Where can I see some explanation 'bout them?
Yes, quite a few.
* "SuperWord" optimizations
* Optimizations for Core2Duo CPUs
Information about them can be find on SUN's blog sites (fetcatair) and the changelogs which links to the bugreports/RFE's covering the enhancement.
Could you be more specific, pointing a url?
JDK7 is in an early stage of its development - so there are no urls which discuss the enhancements in depth. Best is you read the changelog of the ea-builds and read hotspot's developer blogs.
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