It matters deeply to all of us. Here's the gross truth as I know it at the moment.
I know where the lag exists in create route // edit // close (it is in a common piece of all three). This issue is compounded by queries that lag while hitting the tables that store our route data (think of a traffic jam). Unfortunately I've yet been able to come up with an optimization to the core of the lag, but I'm doing my best to minimize interference from other pieces of the website as I find them. This frees resources and reduces direct interference in the route table.
We have a plan of action for the laggiest pieces, but it's an intensive patch (not as ready as other optimizations). In the mean time, when I find something I can fix in 15 minutes or less that would lighten the load and hopefully make the site run a little smoother & faster, I put it in place. Something > Nothing.
Odd statistic. 37% of all pages viewed are the create route page. I've dropped in a small optimization in the alliance portion of the depart menu. Unfortunately the specific improvement is dropping from .3 seconds down to .1... but the faster it goes, the less it's in the way, the fewer resources are used, and hopefully, the faster we all go. Hopefully it's one more city bus taking a few dozen cars out of the lag traffic jam.