Word hands for 30 sec or more when I paste anything other than plain text

[df]

Can anyone tell me why Word hands for 30 sec or more when I paste anything
other than plain text? For example, If I copy text from a Web page, and then
past it into Word, Word hangs. I know I can use Paste Special, but I forget
sometimes, and then I have to wait, twiddling my thumbs, while Word figures
out what to do.

Thanks!!!