I have inherited the support of an application. On an xpage there are on XPages level several data-sources defined e.g.

<xp:this.data>

<xp:dominoView var="view1" viewName="vwOffers" />

<xp:dominoView var="view2" viewName="vwOffersByName"></xp:dominoView>

</xp:this.data>

however, deeper on the XPage a viewpanel control is used with it's own datasource definition

<xp:this.data>

<xp:dominoView var="view3" viewName="vwOffersByFullName"></xp:dominoView>

</xp:this.data>

I am just wondering if this is causing any unnecessary performance? Are the first datasources loaded or not? Or will they be loaded when they are actually loaded when being accessed via a control?

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I cannot answer why the datasources are there while not being used. Maybe they are there for debugging purposes or to check different document-sets.