Well, what I would reommend is to look for a forum that uses that script and has that much activity and ask them what their CPU usage is... if they tell you it is 10-20 then it might be worthwhile to go with it. If they say the same amount as you have now then you will need to change hosts. Which ever you choose, I wish you the best and hope you do not forget us or YaBB
perhpaps we both found this forum -->
I prepared IPB for using a month before, but still use the YaBB.
But I remove from YaBB such features as "30 recent posts", basic search, search users 5-10-20-50 last messages, last subject mod and gzip mod.
Now my hoster not insist very much on converting, because usage is mush lower.
The major reason I am still on yabb. I can't convert my polls from yabb to yabbse.
Maybe you wrote this converter ?
Have you converted personal messages from yabbse to IPB. Mine got lost.
Now I moding my IPB and think after 2 weeks I'll do a last conversion.
by the way, YaBB SP 2 is comin before the end of the year.
My be it worth waiting.