Whats up with lag on quick synth?

So, whenever I run a quick synth it takes 1-2 cycles of spamming the quit button to get out of craft mode. Whats up with this? Definitely put me out of a dungeon run or two from timeout before... why is this even happening? More SE server lag ftl, or is there some 'other' quit button i should be clicking?

Guess nobody else has this problem..?

Press it once and sit there for quite some time. It appears to me that it only checks once per "cycle" at a set time if cancel has been pressed. It does seem to take quite some time though, that I agree with.