Thank you very much for your report. I wasn't fast enough to see the link before the moderator removed it, but even if I did, I wouldn't be able to help you. I didn't change anything regarding the reflow mode (as far as I know). The latest KPV is newer than Librerator-R2, so if KPV behaves better (faster) with the PDF in question, that's probably because it uses newer version of k2pdfopt library. If I publish a new release of Librerator, I'll try incorporating the newest libraries at the time. But don't hold your breath. Except for some very rare cases, I think the version that shipped with R2 works quite good.