When I run PAR, it seems to hang during the initial timing analysis:
"Overall effort level (-ol): 2 (set by user)
Placer effort level (-pl): 2 (set by user)
Placer cost table entry (-t): 1
Router effort level (-rl): 2 (set by user)
Starting initial Timing Analysis. REAL time: 16 mins 2 secs"
One possibility is that a signal, such as reset, has a very high fan-out. Try reducing the fan-out by replicating logic or putting a TIG constraint on the reset signal:
NET "reset" TIG;