I was looking at saving for 95 Construction, but I figured I could save half my cash if I got my butler to take logs to the sawmill first. How much xp/hr would I lose doing it like this? Alternatively, how many logs could I run to the sawmill per hour?

I strongly recommend against having your butler run stuff to the mill, it's slows you down A LOT and you have to remember you have to pay the butler AND the sawmill cost.

 

However, if you were a fast clicker, it's possible to use plankmake and be efficient while doing this.

I wouldn't. In time extra you could have made back that money boss hunting.

Using noted logs is cheaper and if done properly hardly slows down xp.

Using noted logs is cheaper and if done properly hardly slows down xp.

 

When you done properly, what do you mean?

Use a demon butler. Use the logs on him, have him take it to the sawmill, then build doors when you get the planks. Don't use a human butler for this since he's way too slow.

 

Also, it's very easy to mess up since you need to be very fast, or else he'll have to "hold the items till you're done", and you'd screw up your rhythm. I highly suggest you use SC hammers to cut down on cost instead of doing logs -> butler -> planks.