I do not want to edit the PDF or the bookmarks. I want the application to be able to quickly search the document i.e. in less than 5 seconds. I will be using it to search through textbooks. Asking for minimal so that I can do stuff in a few clicks. I also want access to the bookmarks in the PDF.
Since I will be repeatedly accessing a set of textbooks, I don't mind if the application maintians an inverted index for each file.
WPS hasn't worked out for me.