After Implementation, how can I change the timing constraint and then check the timing result without rerunning Implementation?
Below are two solutions:
1. In the Implemented Design, set the new timing constraints in the Tcl console and then run report_timing or report_timing_summary
2. Create a Tcl script with the new timing constraints in it and set it in the tcl.post option of route_design in Implement Settings.
This will run cause report_timing or report_timing_summary to run after Implementation completes.