Search extremely slow in Javadoc format with many classes

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In a large project with many classes, trying to search in the Javadoc output causes lag. I have attached a zip file of the Javadoc output of one of our projects as an example: https://drive.google.com/file/d/1LStjKa1X1WYiaECL9nwV0rif_x5cvEgX/view?usp=sharing