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ISE 10.1.03 vs ISE 11.4

Hi,Until now we have worked with ISE 10.1.03 to synthesize for XC5VSX95T board.Now we have also downloaded the trial version of ISE 11.4 to tray that release before buying it.We have produced the netlist of our design ( without the board framework ) and synthesized it with the both of SW releases.The result of the synthesis are the same about the board occupation, instead the duration of the synthesis are meaningfully different.The synthesis process takes around 2 hours for ISE 10.1.03 while it takes only 30 minutes for the new release ISE 11.4Is it possible a so great optimization in synthesis duration from the old release to the new one?Thanks in advanceDavide
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