Anyway, I tried changing my mod load order. It was totally random, alphabetically at first, and around 20–25 mods I added after the first start of the server were in random order.
I put mods in the following order (categorized them by myself into 5 categories - core mods, crafting mods, gun mods, clothing mods, and QoL mods).
Within categories, I sorted only "Core mods", The rest (within each category) is random.
The new order look like this:
CORE
ModManagerELO;ModManager;modoptions;ItemTweakerAPI;ItemTweakerAPIExtraClothingAddon;ProfessionFrameworkB41Patch;Arsenal(26)GunFighter[MAIN MOD 2.0];Arsenal(26)GunFighter;EasyConfigChucked;UltimateXPTweaker;ToadTraits;LazoloTraits;WaterPowerCmd;MCM;BecomeDesensitized;BetterExerciseEasy;ExpandedHelicopterEvents;ForagingBuff01;TA_UNPACK;BB_CommonSense;errorMagnifier;mld_mhish;
CRAFTING
VehicleRepairOverhaul;ScrapMetalGodOfAllMetal;MoreBuilds;ReLght;PwSleepingbags;ammomaker;TreesHaveLoot;RepairRoads;RepairWallCracks;EasyLightbarRepair;EasyHeaterRepair;ImprovisedGlass;ChipAStone;CleanDirt;CBB;
GUN
Tactical Weapons;Brita;BCGRareWeapons;BCGTools;Remastered Kitsune's Crossbow Mod;Swatpack;SpearTraps;Max;
CLOTHING
GasMaskGlasses;FH;GlassHats;improvedhairmenu;RepairAnyClothes;RepairAnyMod;SpnOpenCloth;Brita_2;StalkerArmorPack;CraftHelper41;
QOL
NepBatteryColor;FixCapacityOverlap;PlayersOnMap;EasyLaundry;BetterSoap;improvedbuildmenu41;TakeAnyAmount;ReloadAllMagazines;RiskyInspectWeapon;KillCount;FasterHoodOpening;RenameContainers;REORDER_CONTAINERS;EQUIPMENT_UI;ProximityInventory;4ColorBicPen;LitSortOGSN_diamond;LitSortOGSN;LitSortOGSN_readOnePage;AutoMechanics;AutoSewing;VISIBLE_BACKPACK_BACKGROUND;Betterhandwash;BetterSortCC;betterLockpicking;Kaldo_CarDashboardRadioButton;MoreCLR_desc4mood;CombatText;CraftHelperContinued;DRAW_ON_MAP;ExerciseWithGear;ExtraMapSymbols;ExtraMapSymbolsUI;faction_safehouses;fuelsideindicator;FuelAPI;P4HasBeenRead;OutTheWindow;LongLifeBulbs;MapLegendUI;MapSymbolSizeSlider;MinimalDisplayBars;MoodleFramework;MoreDescriptionForTraits4166;RainCleansBlood;RainWash;SimpleReadWhileWalking41;REORDER_THE_HOTBAR;BLTAnnotations;showmaterial;ShowSkillUpName;ShowSkillXpGain;snowiswaterbeta;P4TidyUpMeister;Torch;TMC_TrueActions;WaterDispenser;TheStar;wringclothes;contexttools;eris_food_expiry;eris_minimap
The old random mod load order looked like this (not even in alphabetical order of some mods, as I thought):
VehicleRepairOverhaul;ScrapMetalGodOfAllMetal;MoreBuilds;CraftHelper41;Tactical Weapons;ReLght;PwSleepingbags;UltimateXPTweaker;NepBatteryColor;FixCapacityOverlap;ModManagerELO;GasMaskGlasses;ammomaker;PlayersOnMap;LazoloTraits;TreesHaveLoot;mld_mhish;EasyLaundry;WaterPowerCmd;RepairRoads;BetterSoap;RepairWallCracks;MCM;improvedbuildmenu41;BecomeDesensitized;TakeAnyAmount;ReloadAllMagazines;RiskyInspectWeapon;EasyLightbarRepair;EasyHeaterRepair;KillCount;ImprovisedGlass;FasterHoodOpening;RenameContainers;REORDER_CONTAINERS;EQUIPMENT_UI;ProximityInventory;4ColorBicPen;LitSortOGSN_diamond;LitSortOGSN;LitSortOGSN_readOnePage;Arsenal(26)GunFighter[MAIN MOD 2.0];Arsenal(26)GunFighter;AutoMechanics;AutoSewing;VISIBLE_BACKPACK_BACKGROUND;BetterExerciseEasy;Betterhandwash;BetterSortCC;betterLockpicking;Brita_2;Brita;BCGRareWeapons;BCGTools;Kaldo_CarDashboardRadioButton;ChipAStone;CleanDirt;MoreCLR_desc4mood;CombatText;CraftHelperContinued;CBB;DRAW_ON_MAP;EasyConfigChucked;ExerciseWithGear;ExpandedHelicopterEvents;ExtraMapSymbols;ExtraMapSymbolsUI;faction_safehouses;FH;ForagingBuff01;fuelsideindicator;FuelAPI;P4HasBeenRead;GlassHats;improvedhairmenu;ItemTweakerAPI;ItemTweakerAPIExtraClothingAddon;OutTheWindow;LongLifeBulbs;Max;MapLegendUI;MapSymbolSizeSlider;MinimalDisplayBars;ModManager;modoptions;MoodleFramework;MoreDescriptionForTraits4166;ToadTraits;ProfessionFrameworkB41Patch;RainCleansBlood;RainWash;SimpleReadWhileWalking41;Remastered Kitsune's Crossbow Mod;REORDER_THE_HOTBAR;RepairAnyClothes;RepairAnyMod;StalkerArmorPack;Swatpack;BLTAnnotations;showmaterial;ShowSkillUpName;ShowSkillXpGain;snowiswaterbeta;SpearTraps;SpnOpenCloth;P4TidyUpMeister;Torch;TMC_TrueActions;TA_UNPACK;WaterDispenser;TheStar;wringclothes;BB_CommonSense;contexttools;eris_food_expiry;eris_minimap;errorMagnifier
Why am I mentioning that? I don't think I have mods that have conflicts, but maybe I'm wrong. Anyway, before, when I was starting the server through the StartServer64.bat file, it took around 3 min 30 to start (with 117 mods; never measured the time before so maybe a little bit shorter). The server now boots up in 1 minute and 20 seconds. Anyhow it's faster now.
I'm mentioning that because somebody may find it useful (probably not xD).
And thank you for your help, Beard!