Its not the distance that really matters, its the amount of nodes used in the calculation. Have you ever tried to calculate a route near the galaxy center?
The 1000 ly ensures you don't end up with too many nodes when the route goes through the galaxy center.
Yeah, it's a balance of slow plots in very dense areas (the core) and plots failing in very sparse areas (the rim, and above/below the galactic plane).
Ideally we'd have the option of plotting waypoints along the way. Move a few hundred Ly, select a system (A) and plot a route. If it succeeds, move another few Ly and plot again to a new system (B); it doesn't replace your plotted route but starts plotting from A to B. If it succeeds again, move on again and plot from B -> C. If it fails, search around for other B candidates.
You could do the same thing by plotting routes of a few hundred Ly, then when you reach the end, plot again; but that way you could get stuck at dead-ends. This way you can search for a route before setting off.
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The loading of NPC portraits is still incredibly slow (around 10 seconds most of the time). Can you please add a loading indicator/animation to them if you can't speed them up more than this?
Yeah, very slow on mine. The empty space looks a bit odd, a placeholder image would be good. (A silhouette, or a pixelated/compressed/white-noise image which - when the avatar is created - resolves into the NPC's image).