Just a general FYI: Since I have all new electronics & firmware I did a comparison of print times vs jerk settings vs quality in Repetier+RADDS using the #3DBenchy as my test subject. Lots of pictures and numbers! 
Nice set of tests! Since both of the variables you tweeted are very much linked to mechanics of your printer, would be nice to include that in your description.
You mean call out this is on my C-Bot \ core-xy…? in my blog post, or this post?
So 20 it is?
You claim faster print speed, but I see all the same times listed.
@ThantiK : Can you be more specific? When you mean speed do you mean print time? The 60mm\sec were the same print time at both 10 & 40 jerk (which I call out), but all the others clearly vary.
@Ariel_Yahni_UniKpty : lol, Honestly I should probably do one more test at 20 as well, considering it’s the default. But better something than nothing 
@Eric_Pavey ​ please post results on that, haven’t changed jerk on mine. It’s good that you now changed to repetier. Could not bare Marlin for one second.
@Eric_Pavey yes, the print time.
Great tests. Thanks
Thanks for the test, maybe you can add better pictures, they are quite blurry and it’s hard to see the differences.
I can tell from the pictures, that you had autocooling/ auto-slowdown activated. If testing jerk and speed, you want to deactivate any automatic slow-down mechanism.
Its a nice test, thanks for sharing. I will definitely be playing with that a bit.
@Volker_Klaffehn Thanks for the feedback: Did you click on the pic to expand them? You can make out the layer-lines, even see specs of dust. I don’t think I can get them much more in focus.
@Rene_Jurack : Cooling fan yes (it’s PLA), but no auto-slowdown. In fact, the smoke-stacks suffered due to the heat buildup and would have improved if auto-slowdown was enabled there. I had it turned off specifically so as to not impact the test in the way you describe.
@Eric_Pavey Yes, I clicked them 
I can see the differences in the pics, but they ‘feel’ blurry, maybe because of that shallow depth of view. For such small pieces I don’t use one of my ‘real’ cameras but my smartphone, because more of the part will be sharp.
@Volker_Klaffehn : I feel you. I only can work with what I got. Maybe my next project should be an electron microscope 
Part of the issue too is that PLA is quite translucent (which I didn’t realize until I started the test, never had used it before), which is probably contributing to the ‘blurriness’ you’re experiencing.
If you’re comparing build times then I think it is important to use settings with a minimum layer time enabled. In many prints it can remove the practical incentive to increase speeds. Why risk potential failure and lower quality by doubling speeds when the gain is only a few minutes or percentage points of build time? Don’t get me wrong though. I appreciate that you published your results. Talking in terms of build time is a lot better than talking about speeds.
In the speed vs time debate, I’d like to know if you have a heated bed and how long it takes to heat up? If it’s 10 mn then you have a bigger difference for the real print time!
@Billy My goal here was simply to report the differences, not vouch that one was better than the other. I specifically increased speeds to see the effect on time. I knew there wasn’t a 1:1 in that area, and also wanted to compare that against what happens when you adjust the jerk.