Synplify - Not satisfactory results with re-timing

[srini]

Hi,
I had a strange experience with the Synplify Pro 8.4. I used the
re-timing option thinking that it will help to improve the timing
performance of the design as they have claimed in their docs. But my
design's timing performance has gone down by about 5 Mz and I ended up
not meeting my timing constraints. Why is it so? Can anyone tell me
about this?

Thanks & Regards,
Srini.