We needed to add functionality, namely showing 1 degree lat/lon ticks (the + symbol), between the solid lines when they are spaced 5 degrees apart. I used code found on your site to create ours. It worked very well.
We have since moved from a decimal degree projection to a web mercator one, and our base map limits are 300 lon east to 0 west. Our code now has to convert the lat/lon locations of the lines to the new extent in the drawing loop. This is slowing down the redraw, something we didn't see when using decimal degrees. Do you know of any ways to speed up the conversion?