This article is a legacy article. It applies to previous versions of the Liferay product. While the article is no longer maintained, the information may still be applicable.
Before LPS-34161, there was redundancy in the search portlet which would manifest when multiple asset publishers were present on a site. The more asset publishers that were present, the slower search would be. Until this point the performance had an inverse relationship with the number of asset publishers along with the number of search results.
If you would like to take advantage of a more efficient search algorithm, simply open a request and request a hotfix for LPS-34161.