Hosting limitations with mass autoblogging

I'm trying to setup my autoblogging software to the next level where I import a csv to make me 100 subdomains. Right now I'm running about 12 sites under my root domain, and 10 of those were created using a csv file I created although when my plugin gets to about #16-17 on the sitelist it starts going excrutiatingly slow to the point where at 19 it stops and if I cancel it my wp admin is extremely slow as well. I have to delete a few sites to get my admin and other blogs loading efficiently again. So my question is, is this something that will happen with these shared hosting packages, is my only option to go to a vps/private server? I've already attempted to raise the ram on my service but apparantly I'm already at 64MB. So if anyone has any experience with either of these companies does it sound right to you that the 64MB memory limit could be reached with only 15-20 subdomains.
They are all very lightweight too. that template I bought was designed to be used in autoblogging/massblogging and the only plugin I'm using aside from my autoblogging software is a cacheing plugin.

Get more memory 64mb of ram is really low...if you want a comparison, I have ~130 autoblogs and am using 329mb of ram.

Great thank you the clarification.

I really liked whole reseller account setup. Being able to create a separate account for each of my wp domains is what I'm looking for. Do you know of any dedicated servers or vps that I can still do something like that?

I'm with HG VPS level 3 and my blogs are just running fine. No complaints so far.

just curious...who's your current host?

I'm currently under the dilemma of using either hostgator or bluehost

I'm with HG too silver package, the 50 dollar a month one. Can't get past ~13 subdomains without it timing out.

Wickedguy I'm curious how many blogs you running on your account.

You in the Autoblog JV? If So May we make some Money!

host gator level 3 vps is like reseller account. You can make as many accounts and packages as you want. Plus, I now have 140+ autoblogs using only 40% of RAM.