Safari is a memory hog?

I just noticed the following when I ran the top command a couple of minutes ago:

  PID COMMAND      %CPU   TIME   #TH #PRTS #MREGS RPRVT  RSHRD  RSIZE  VSIZE
 3368 Safari      10.1% 82:36.27  29  1556  2917   175M- 26.0M   153M-  740M-

Does Safari really need 740 MB of virtual memory? Seems a tad bit much.