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OP and ED sequences can often have much more information in them than the programs themselves. Often the OP and ED are more animated with more on-screen activity than than program material. This means they make greater demands on your computer, especially H.264-encoded videos which are often contained in Matroska (MKV) files. I couldn't play the Kure-nai opening smoothly on a computer which played most every other file without problems. The OP for Nodame Cantabile also had substantial lags when I tested it on a netbook with an Atom processor. The actual story content played smoothly.
I've wondered whether the additional bandwidth demands of the OP/ED audio play any role here, though audio is generally so small in comparison to video it doesn't seem likely to matter. I bet some of our talented and experienced encoders could provide a better answer to these questions.
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