Performance check showed that I was checking every sprite even if they're way far away so now just do ones near-ish.

tests/spatialmap.cpp

@@ -152,7 +152,7 @@ TEST_CASE("confirm can iterate through all", "[spatialmap-sort]") {
       collider.insert({x,y}, ent);
     }
 
-    auto sprite_distance = collider.distance_sorted(player);
+    auto sprite_distance = collider.distance_sorted(player, 10000);
 
     int prev_dist = sprite_distance[0].first;