The DC's default Static timing Analyzer (STA) engine is Nautilus Delay Analyzer. It's slower and lower performace than PT's STA.
And there're 2 version of PT call PT-overlay and PT-stand alone .
PT - overlay let u to install PT STA in DC directory and overlay with DC.
For the most timing consuming operation in search muliple paths by -from
-through -to , it had better run in PT. DC often run into a endless loop and
can not handle this.