I myself changed to 1.5 since you use oils and such and quite a bit of it to make it to give it that extra bonus to use for dedicated paths / roads. But more and more people use concrete for everything else and that is at 1.4 speed. But your default is 1.3 and I feel that is a bit slow.
By design the walking speed modifier is lower than that of concrete to keep concrete still useful as a floor for your factory. After some tests i think the difference between 1.3 and 1.4 is somehow noticeable and might be irritating. I will reconsider to change the value to 1.4 with the next release.
