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Microsoft word generates some very mysterious and complex HTML "MsoNormal". This HTML affects the blogs pagination. This is why you notice some big blogs with lots of articles suffer from segmentation. This mysterious HTML could also cause the blog to load slowly both in blogspot and wordpress blogs.
So if you have have been copy-pasting from ms word to your blog i will advice you stop using it. Notepad is a preferable text editor which you can use to compose your blog posts and paste it to your blog. But still if you like using microsoft word you can use (CTRL+Shift+V) to paste content to your blog without the "MsoNormal" formatting.