Add option to limit convoy travel distances.

CPU load seems to scale with route length, so add an option to limit
the length of the convoy route. The tradeoff is that the performance
sensitive route won't necessarily be a correct route.

game/settings/settings.py

@@ -378,6 +378,12 @@ class Settings:
         section=PERFORMANCE_SECTION,
         default=True,
     )
+    convoys_travel_full_distance: bool = boolean_option(
+        "Convoys drive the full distance between control points",
+        page=MISSION_GENERATOR_PAGE,
+        section=PERFORMANCE_SECTION,
+        default=True,
+    )
     perf_infantry: bool = boolean_option(
         "Generate infantry squads alongside vehicles",
         page=MISSION_GENERATOR_PAGE,

gen/convoygen.py

@@ -10,6 +10,7 @@ from dcs.unit import Vehicle
 from dcs.unitgroup import VehicleGroup
 
 from game.dcs.groundunittype import GroundUnitType
+from game.theater import FrontLine
 from game.transfers import Convoy
 from game.unitmap import UnitMap
 from game.utils import kph
@@ -38,11 +39,26 @@ class ConvoyGenerator:
             convoy.units,
             convoy.player_owned,
         )
+
+        if self.game.settings.convoys_travel_full_distance:
+            end_point = convoy.route_end
+        else:
+            # convoys_travel_full_distance is disabled, so have the convoy only move the first segment on the route.
+            # This option aims to remove long routes for ground vehicles between control points,
+            # since the CPU load for pathfinding long routes on DCS can be pretty heavy.
+            frontline = FrontLine(convoy.origin, convoy.destination)
+
+            # Select the first route segment from the origin towards the destination
+            # so the convoy spawns at the origin CP. This allows the convoy to be
+            # targeted by BAI flights and starts it within the protection umbrella of the CP.
+            end_point = frontline.segments[0].point_b
+
         group.add_waypoint(
-            convoy.route_end,
+            end_point,
             speed=kph(40).kph,
             move_formation=PointAction.OnRoad,
         )
+
         self.make_drivable(group)
         self.unit_map.add_convoy_units(group, convoy)
         return group