I can't promise you any solace for your problem in converting to WordPress, but I have great performance with that tool. Our regular commentaries at http://macnightowl.com take only seconds to post. Our full newsletter around 10-12 seconds or so, but I have a speedier connection than you (Cox at 12 megabits download).
So maybe it is your blog, assuming your Internet connection is otherwise quick.
By the way, your blog site is a little slow to display, and there are letterspacing issues. Is that your blog software?
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