I suggest the OP could have been better worded:
(1) the title should say something like "Inquiry about transfer rate" instead of just "Inquiry"; this would make the thread more useful for everyone,
and (2) "Looking forward for a clear response from your side" is unrealistic: posting in a forum is more likely to produce an interestingly varied response than a clear response;
but those quibbles aside, this as an ideal place for the OP to ask that question. For one thing, the dreamhost website says,
Well, someone please correct me if I'm wrong, but I think the wiki has nothing worth reading about this question.
This forum, on the other hand, has a lively thread on the subject from 2007, but which is probably too old to be relevant now. It's worth asking the question here again.
Asking the question here instead of through Dreamhost technical support makes good sense, if it would produce a snapshot of
(1) what transfer rates experienced customers are actually getting
(2) how well it matches what they think they should be getting.