> But, searching a PDF for a keyword is far less good than the search > method in bookmanager read, both in performance and in the > presentation of the search result. (Even though FoxitReader searches > faster than Acrobat reader, both need to scan the whole PDF file what > takes time).
Only if the PDF is not indexed. If you use the full Acrobat package to generate the PDFs, there is a pdfindex tool that can be used to generate a index of a collection of PDFs. If you use that regularly, the search performance is comparable between the two.