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Prevent Spotlight Search from indexing unnecessary files
Spotlight needs to index your entire phone's contents regularly so that it can serve up the best results. This may not use up a whole lot of processing power, but it's certainly helpful in the long run by removing items from the list that you don't use.
You can select which areas of your phone to index by heading to Settings > General > Spotlight Search and tapping any item you wish to exclude from the search index.