The 50% increase on the farms seems to be giving 74%. If achievements or progression changes, then it might not be an issue, though, because I've gotten every achievement. Also, when getting over at most 6 million in the reds, the quantities of resources get cut off when inside the farm menu.
Edit: I would recommend an upgrade that further reduces upgrade time with the addition of the farm. With the ability to gain 40k resources in less than 15ish minutes (4 level 7 farms), you should be able to quickly upgrade your townsfolk faster too.
Edit 2: When you level up the farms, the timer goes up by 10 seconds each level, but when you reload the game, the timer is reset, either restoring or removing the correct amount of time you should have.