Hi, I have a routed design (using silicon ensemble) to begin with to which I make modifications like adding additional logic (nets and components) afterwhich I place the design all over again and re-route. Is it possible to estimate congestion - in view of new nets being added? Is it possible to get capacitance information - using the dspf files that are written out? What do I look for either in a .dspf or .rspf file? How do i use the HyperExtract option while doing report RC - will that help? I currently have def and dspf file of design before modification and def and dspf file of design after modification. Any help would be appreciated. Thanks, Suresh