There are worse afflictions than this one. Are you sure that snail was the same snail? Snails tend to look alike. I had one that always appeared appeared on my front stoop after rains -- it would be there all day, whenever I came came and went, somewhere right at the top of the steps. Then, one rainy day, I whimsically smushed it underfoot on the way out.* Imagine my surprise when I came back and another snail was there, scant inches from the mutilated corpse of it's cousin. My conclusion is they are not so much slow as solitary.It's actually a habit I have developed and is so ingrained
to my essence that I don't see it changing. However, my
lines have gotten longer over the years.
* just kidding. They are no good to eat if you smush them first.