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Asked: 2026-06-05T00:52:42+00:00

Seems like a straightforward question but there must be something I’m missing. Perusing the

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Seems like a straightforward question but there must be something I’m missing.

Perusing the famous Yahoo “high performance frontend” recommendations, I came across the phrase

Pack components into a multipart document

and then short brief blurbs which didn’t really elaborate very much on the how-to side of things.

I know there’s a multipart header, and that emails are split using multipart boundaries, but further searching hasn’t revealed much more…can someone explain what the heck this means and what situations it applies to?

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1 Answer

  1. Editorial Team

    The multi-part documents, I believe, only works well with IE; the idea is to pack the HTML and all images into one document (like how mime emails work).

    See also: http://en.wikipedia.org/wiki/MHTML

    I wouldn’t go down this route; I think it’s better to just aggressively cache your external scripts, images and style sheets. It’s just more practical and in most cases will yield the same performance.

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