It hangs because the station range is across 87', and marking stations at every 0.05' (1740 lines) is literally pouring ink on the page from a bottle.
The same, the vertical range is 4', and you are setting grid lines at every 0.01' ... building 400 lines with more ink.
Likewise, if your snap is active they are all snapped to the same place.
That is why I said your parameters are not practical.
If water can shed at a 2% grade, why should you need to analyze every hundredth of a foot?
Just asking.