My computer's ability to use the map is somewhat limited, I will pick a destination, then start writing down the route from that destination as soon as it's path is resolved, if I'm lucky, I'm within 30 LY of my start point before my computer overheats and shuts down (it's a 2-in-1 Tablet with a 4 core Atom CPU, the fact it runs ED at all is miraculous). Then in another 10 minutes of having the computer off... usually not my choice, I will finish the route, then after another 10 minutes, I'll start flying toward my destination with my route on a weaker computer's text file.
My format tends to look a bit like this:
...
34.76LY LP 915-27
41.49LY AO
48.25LY LHS 2891
...
I won't bother updating distances listed but the distance helps me plan my routes better, as I will know when to take breaks to drop off scan data.
If I'm doing pure exploration (I am an explorer) it will also tell me when to dock to prevent excess backtracking... I have lost system data to players interdicting me because they couldn't be bothered to scan me for cargo modules. I've since replaced the hauler with a more combat oriented ship, which should help. I'll know for sure when I reach my next destination, and pay an alliance fine for a paint swap incident kicking me back into the docking bay.
There's been moments I've considered going outside given we're in winter at my area and just playing ED in the cold... the advantage would be the computer would benefit from the improved cooling, the downside is I would be in the same cooling environment and wouldn't benefit as much.
I wonder if the display of the available routes might contribute to the lag. I do know the jump range calculations appear to be based partially on distance, and partially on prior routes not intersecting a star. I wouldn't know any more than anyone else on the topic unless I could somehow see the formula and functional logic of the sorting routine. I'm kinda with Saviornt, in that it feels like a Dijkstra style sort.
I'm sure in future updates the mapping system will be improved, for now... it seems to be a better off switch for my computer than the power button.