Why does my Sitecore website perform so badly?

Eldblom

After many years of doing a lot ofreviews on Sitecore I would conclude that it more or less always comes down to one single thing when pages perform badly: bad code. And when I mean bad code, I mean code iterating an excessive amount of items.

Iterating A LOT of items

Previously we used to see a lot of calls to descendants when solutions were using axis, xpath or Sitecore Query, but luckily this is a disappearing trend with the introduction of Sitecore Search in Sitecore 7. This does not mean that there are less bad code – maybe even on the contrary. The use of ORM and abstractions in many solutions means that layers of code can easily hide item iterations. Neither of the two patterns or technologies are inherently bad, but they do provide means to hide “bad code”.

The ARGH! Example

The example in the diagram below…

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