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Make your reprocess actions as specific as possible

Reprocess actions can cause execessive processing, especially if you reprocess more than needed. This could result in a larger queue of jobs, and it will take longer for all your views to be updated. Because of that, it’s important to make your reprocess actions as precise as possible, by using originId or a precise filter so you only target the schemas and source entities you actually need to reprocess. Read more about reprocessing.

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Exclude properties from lookup if you don’t need them

By default when you do a lookup in a schema, the entire source entities are loaded from storage, including the properties object.
Full source entity including all custom properties
{
  "sourceId": "gid://Source/e3211d99-e496-4e11-af3d-328eb543619f",
  "id": "gid://Source/e3211d99-e496-4e11-af3d-328eb543619f/Entity/1098-en-us",
  "type": "home",
  "originId": "1098-en-us",
  "originParentId": null,
  "url": "https://fairy-tales.com/",
  "updatedAt": "2023-07-18T08:20:41.8162846Z",
  "redirects": [],
  "properties": {
    "title": "Fairy tales by H. C. Andersen",
    "text": "Read the wonderful fairy tales from the danish author and poet Hans Christian Andersen. Classic tales like \"The Emperor's New Clothes\", \"The Snow Queen\" and many more.",
    ...
  }
}
But in some cases you don’t need all the custom properties, only some of the base fields like originId, originParentId, or url. In these cases it’s important to specify that in the lookup, as this will improve performance and lower the amount of time it takes to generate views. You do that by setting excludeProperties to true in the lookupOptions parameter.
lookup with excluded custom properties
properties: async function (sourceEntity, context) {
  const fairyTales = await context
                          .lookup("type eq 'fairyTale'", { excludeProperties: true })
                          .limit(3)
                          .toPromise();

  return {
    fairyTales: fairyTales
                  .map((fairyTale) => ({
                      // fairyTale.properties is not available
                      id: fairyTale.originId,
                      url: fairyTale.url,
                  }));
  }
}