I am having the same issue with Affinity Designer V2.... Most of the time I can't get my PDFs to export at all, or if I do it takes 30+ minutes for a single file that's under 2 MB..... other times they export within a few seconds. They're all very similar files with similar sizes, all using the same settings when exporting. I tried to use the old version of Affinity to see if that makes a difference, but since I utilized some of the V2 tools it wouldn't let me open the file. I'm WAY past a deadline and I still have about 30 files to export. I don't know what else to do at this point but I REALLY need a solution. I took a screenshot of my export settings but for some reason I cannot attach it. the button to attach files just says "loading..." and I can't click it.