I'm using Win 10 and an SSD drive. Most times a preset refresh takes 3 to 5 seconds but I have also had it slow down to take 45 seconds to a minute. This slowdown is usually after I have been editing for a while. Might also be when the FM3 preset is using high cpu and also if Axe Edit is also running. Next time it happens I will note what my environment is and what I was doing. TBH when this happens I'm usually frustrated and just shut it down as all FM3 functions slow to a crawl... next time I will persevere.
