Recoll developer Jean-Fran�ois Dockes was kind enough to respond to a personal email regarding this issue. He noted that Recoll uses a Webkit object to display results, and suggested I consider building the program with the --disable-webkit switch. I looked at the documentation for building the program, and decided that this effort would be beyond my skill level. However, I tried another troubleshooting step on my own: I installed Recoll under openSUSE Tumbleweed on a portable computer with an integrated graphics controller, and indexed a copy of the same drive (with 100,000+ files). The results were identical to those described in the first two paragraphs of this ticket: immediate display of number of hits, looong delays to show results, and screen fragmentation. The installation on the portable is _not_ in a virtual machine, and the portable does not have an nvidia driver. YAST2 in openSUSE indicates that I have libwebkit2gtk-4_0-37 installed, and that libwebkitgtk-1_0-0 is available in the repository. For now, I will continue indexing the drive with Recoll in the Linux Mint virtual machine.