I've never tried to run Zope on Solaris but Tres has. Hilarious conversation between Brian Sullivan and Tres Seaver, spied on the Zope maillist today:

 >>Except for the fact that it will seem dog slow, Zope runs fine on
 >>Solaris.  The major issue seems to be that the threading model in the
 >>Solaris libc is especially punitive for long-running, multi-threaded
 >>Python applications.
 >>
 > 
 > Dog slow as compared to what?

 As compared to commodity server-class Linux/Intel hardware (which will
 cost you around 1/4 to 1/3 what the "equivalent" Solaris rig does).

 > I would prefer to do the absolute
 > minimum in terms of tuning. Most of my experience with Zope and
 > otherwise is with Windows. Can I potentially get by just installing
 > and running? How would it run that way on a current Solaris server
 > with appropriate memory compared to say running on a P4 3meg Win2003
 > machine with appropriate memory.

 Let's put it this way:  even if you get paid in cheese sandwiches, it
 will be cheaper to buy a 1U lintel box to run the server than the time
 you spend trying to figure out why it is so slow on Solaris, let alone
 the time you spend trying to remediate it.  Unless somebody has a gun to
 your head, you should not run Zope on Solaris in *any*
 performance-critical environment.