my blog’s comments are broken

My hosting provider (Dreamhost, who I recommend) has informed me that my mt-comments.cgi script is taking up too many resources on my hosted server so they had to turn it off. That means no one can comment to my blog until I fix that.
I like MT but I’m not sure I want to upgrade to 4.0 and it’s not clear to me that moving to 4.0 will fix this issue. In any case, please give me a bit of time to fix my blog comment software.