I wanted to search a term inside a bunch of pdf's and I earlier thought it's maybe not possible with windows search. So today did a bit of googling. Turns out till windows 10, you needed a separate IFilter to be installed and enabled to search inside PDF files. But with Windows 11, the support for searching inside PDFs is present already in windows. The option is "File contents" in Search options after searching a term. I found that it seems to work fine. Also with SSD's in place of HDDs, the search is not crippling the system. That makes me wonder, if whoever developed the windows search functionality - originally targeted SSDs only. That would make complete sense. And also reason out why windows 7-10 were bad on old hardware and why HDDs were such a bottleneck. Of course, one reason is also crappy laptop HDDs by western digital and Seagate, giving bad random read/write scores of few KBPS. Anyway seems like one mystery solved! Cheers!!