Bind9.5.1 Multithreading

[Bind]

I have worked with bind 9 in single thread,but i want to upgrade my server 
to solaris 10 and bind 9.5.1-P1(my machine has 4Gig Ram and 2 cpu(900mhz))
Based on practical experience:
does enable multithreading for Bind 9.5.1 is good or not?
(with considering stability and simple management)
Regards
Iman
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