public static void SimGameState__OnDefsLoadComplete_Postfix(SimGameState __instance)
        {
            if (UnitAppearanceDateMorphFeature.AppearanceDatesAdjusted == true)
            {
                Logger.Debug($"Appearance dates have already been adjusted.");
                return;
            }

            if (Myself.Settings.SetAppearanceDatesForMechsLackingSuch)
            {
                Logger.Debug($"Setting appearance dates for mechs lacking...");
                var mechAppearanceData       = CoreMod.CoreModSingleton.MechAppearanceData;
                var mechsSansAppearanceDates =
                    __instance.DataManager.MechDefs
                    .Where(pair => !pair.Value.MinAppearanceDate.HasValue)
                    .Select(pair => pair.Value);

                mechsSansAppearanceDates
                //.AsParallel()
                //.ForAll
                .ToList()
                .ForEach
                    (mechDef =>
                {
                    Logger.Trace($"Mech [{mechDef.Description.UIName}] lacks an appearance date, attempting to set it...");
                    var mechModelEntry = mechAppearanceData.FirstOrDefault(model =>
                                                                           model.Name.Trim('"') == mechDef.Description.UIName);
                    DateTime?appearanceDate = null;
                    if (mechModelEntry != null)
                    {
                        appearanceDate = new DateTime(mechModelEntry.Year, 1, 1);
                    }

                    appearanceDate = mechDef.MinAppearanceDate ?? appearanceDate;
                    Logger.Trace($"Setting appearance date for [{mechDef.Description.UIName}] to [{appearanceDate}].");
                    var traverse = Traverse.Create(mechDef).Property("MinAppearanceDate");
                    traverse.SetValue(appearanceDate);
                });
            }


            Logger.Debug("Dynamically adjusting appearance dates...");
            var appearanceFactor = AppearanceUtils.CalculateAppearanceDateFactor(__instance.GetCampaignStartDate(),
                                                                                 Myself.Settings.CompressionFactorControlDate,
                                                                                 Myself.Settings.CompressionFactorTargetDate, Logger);

            __instance.DataManager.MechDefs
            .Where(pair => pair.Value.MinAppearanceDate.HasValue)
            .Select(pair => pair.Value)
            .ToList()
            .ForEach
            //.AsParallel()
            //.ForAll
                (mechDef =>
            {
                Logger.Trace($"Calculating new appearance date for [{mechDef.Description.Id}]...");
                var appearanceDate    = mechDef.MinAppearanceDate;
                var newAppearanceDate =
                    AppearanceUtils.CalculateCompressedAppearanceDate(__instance.GetCampaignStartDate(),
                                                                      appearanceDate.Value, appearanceFactor, Logger);
                Logger.Trace($"Setting appearance date for [{mechDef.Description.Id}] to [{newAppearanceDate}] from [{appearanceDate}]...");
                // mechDef.MinAppearanceDate = newAppearanceDate;
                var traverse = Traverse.Create(mechDef).Property("MinAppearanceDate");
                traverse.SetValue(newAppearanceDate);
            });

            UnitAppearanceDateMorphFeature.AppearanceDatesAdjusted = true;
        }