You know, Adobe has a moreless "local" tool (called "Contribute") for managing and authoring content that I believe simply pushes content as static pages from your local machine.
Apple also has something that's pretty ridiculously simple to use (but severely lacks flexibility and features). I think it's called iWeb or something goofy like that. I used it before for a client, and like all things apple, it was pretty dumbed-down and user friendly.
Honestly, though, I have no idea why your site would be screeching to a hault like that ... even with 1,000+ pages of content. If your pages are pretty straight-forward in terms of content and features, then it's likely that there's a pretty simple and obvious bottleneck somewhere that could be worked out. Could just be an issue with resource bandwidth limits with your hosting situation -- probably could be rectified by moving to a slice of resources on a VPN or something like that (but obviously I have no idea what your hosting situation is).
I mean ... I've got a Real Estate site running on Joomla for a client that literally stores and queries 100,000+ properties and it's still pretty quick to manage. And that's running on shared hosting for like 20 bucks / month!