DayOne

DayOne This is the mod used by the DayOne servers. It contains modifications we deem important to create a genuine hardcore survival experience. Join our discord for more information: https://discord.gg/6rYJvnt Credits: Thanks to DaemonForge for allowing the repack of the "Basic Ear Plugs" mod. Thanks to affenb3rt for allowing the repack of the "AFK kick" and "Give&Take" mods. Thanks to Wardog for the server kick message fix. Thanks to Inkota for the Camo Net Poncho. Thanks to Windstride for the Bear & Wolf Headdresses. Thanks to Ruby for the Bone Knife & Hatchet and @AnArtistsMalady for the bone texture. Cannibal laugh timing change integrated with permission from DayzUnderground. Do not steal or repack without permission.

Workshop 2110459075 · mod updated 2026-06-24 · analyzed 2026-10-03 07:37 UTC · history · 59 script files

Stall risks

None found

No file I/O on hot paths, no timers created per event, no per-player-per-frame hooks.

Compatibility

10 by design

10 chain breaks, all on specific classes the mod replaces wholesale — matters only if another mod patches the same classes.

Structural footprint 1.1

10 by design

Heavier than 73% of 328 scripted mods analyzed.

0.0152% of each server frame at 100 players (0.152 ms/s). Counts hook dispatch and timers only, not what the hooks do inside. Methodology.

Where this mod sits

Structural load of the 328 scripted mods analyzed, lightest on the left. This mod's bar is lit; 40 others share it. Ranked list.

24 mods
0.0000022 to 0.0000046 ms/s · grade A
7 mods
0.0000046 to 0.00001 ms/s · grade A
1 mod
0.00001 to 0.000022 ms/s · grade A
1 mod
0.000022 to 0.000046 ms/s · grade A
37 mods
0.0001 to 0.00022 ms/s · grade A
26 mods
0.00022 to 0.00046 ms/s · grade A
33 mods
0.00046 to 0.001 ms/s · grade A
22 mods
0.001 to 0.0022 ms/s · grade A
13 mods
0.0022 to 0.0046 ms/s · grade A
10 mods
0.0046 to 0.01 ms/s · grade A
5 mods
0.01 to 0.022 ms/s · grade A
18 mods
0.022 to 0.046 ms/s · grade A
17 mods
0.046 to 0.1 ms/s · grade A
This mod
26 mods
0.22 to 0.46 ms/s · grade A
28 mods
0.46 to 1 ms/s · grade A
8 mods
1 to 2.2 ms/s · grade A to B
10 mods
2.2 to 4.6 ms/s · grade B
1 mod
4.6 to 10 ms/s · grade B to C

A316

B11

ms/s, log scale: each labelled step is ten times the one before. Letter grade and mods holding it below the axis.

Where the load comes from

Repeating timers carry 93% of this mod's structural load. 0.152 ms/s in all.

Event hooks · 6.9%
7 hooks · 0.01 ms/s

Lifecycle hooks · <0.1%
4 hooks · 0.000008 ms/s

93%Repeating timers · 93%
1 timer · 0.14 ms/s

Event hooksrun when something happens: an inventory move, a hit, an action	7 hooks	0.01 ms/s	6.9%	`Grenade_Base.EEItemLocationChanged`, `Grenade_Base.OnInventoryEnter`, `Grenade_Base.OnInventoryExit` and 4 more
Lifecycle hooksrun when an entity is created, loaded or deleted	4 hooks	0.000008 ms/s	<0.1%	`Land_FuelStation_Feed.EEKilled`, `MissionServer.InvokeOnConnect`, `MissionServer.OnInit` and 1 more
Repeating timersstay in the timer queue, which is walked every frame	1 timer	0.14 ms/s	93%	`every 20 ms`

Counts how often each hook is dispatched and how many timers stay alive, not what the code inside does. Some rates are order-of-magnitude estimates; the methodology lists which.

Chain breaks, by consequence

10 overrides that skip super(), ranked by how much they can affect. On any server a break replaces vanilla's behaviour on that method and silences every earlier-loaded mod hooking it.

By design

2 leaf classes

2 classes replaced on 2 methods · 4 overrides

EEKilled · OnExplosionEffects

Only these classes are affected. Matters only if another mod in your stack patches the same classes.

2 classes

Land_FuelStation_Feed, land_fuelstation_w_feed

4 locations

DayOne.pbo::4_World\Entities\Building\Specific\Land_FuelStation_Feed.c:5
DayOne.pbo::4_World\Entities\Building\Specific\Land_FuelStation_Feed.c:9
DayOne.pbo::4_World\Entities\Building\Specific\Land_FuelStation_Feed.c:38
DayOne.pbo::4_World\Entities\Building\Specific\Land_FuelStation_Feed.c:42

By design

Leaf class · Heatpack

Heatpack replaced on 2 methods · 2 overrides

OnWork · OnWorkStart

Only this class is affected. Matters only if another mod in your stack patches the same class.

1 class

Heatpack

2 locations

DayOne.pbo::4_World\Entities\ItemBase\Heatpack.c:11
DayOne.pbo::4_World\Entities\ItemBase\Heatpack.c:3

By design

Leaf class · CAContinuousFillCoolant

CAContinuousFillCoolant replaced on 1 method · 1 override

CalcAndSetQuantity

Only this class is affected. Matters only if another mod in your stack patches the same class.

1 class

CAContinuousFillCoolant

1 location

DayOne.pbo::4_World\Classes\UserActionsComponent\ActionComponents\CAContinuousFillCoolant.c:3

By design

Leaf class · ExplosionTest

ExplosionTest replaced on 1 method · 1 override

ExplodeNow

Only this class is affected. Matters only if another mod in your stack patches the same class.

1 class

ExplosionTest

1 location

DayOne.pbo::4_World\Classes\Explosion.c:7

By design

Leaf class · CraftSuppressor

CraftSuppressor replaced on 1 method · 1 override

Init

Only this class is affected. Matters only if another mod in your stack patches the same class.

1 class

CraftSuppressor

1 location

DayOne.pbo::4_World\Classes\Recipes\Recipes\CraftSuppressor.c:3

By design

Leaf class · BrainDiseaseMdfr

BrainDiseaseMdfr replaced on 1 method · 1 override

OnTick

Only this class is affected. Matters only if another mod in your stack patches the same class.

1 class

BrainDiseaseMdfr

1 location

DayOne.pbo::4_World\Classes\PlayerModifiers\Modifiers\Diseases\BrainDisease.c:8

Where this mod runs often

Hooks on per-frame and high-rate surfaces, with what their bodies call. Body work, not the hook itself, is what costs frame time.

EEItemLocationChanged on Grenade_Base

every inventory move

no I/O, timers or RPC

OnInventoryEnter on Grenade_Base

every inventory move

no I/O, timers or RPC

OnInventoryExit on Grenade_Base

every inventory move

no I/O, timers or RPC

OnVariablesSynchronized × 2 classes

per event

no I/O, timers or RPC

ActionCondition on ActionDigGardenPlot

per event

no I/O, timers or RPC super() on some paths

SetActions on PlayerBase

per event

no I/O, timers or RPC

Other findings

super() only on some paths · 5 · warning
- ActionTargetsCursor.GetItemCargoCount calls super.GetItemCargoCount() only on some paths — on the others the chain below this mod is dropped. DayOne.pbo::5_Mission\GUI\ActionTargetCursor.c:72
- ActionTargetsCursor.GetItemDesc calls super.GetItemDesc() only on some paths — on the others the chain below this mod is dropped. DayOne.pbo::5_Mission\GUI\ActionTargetCursor.c:44
- ActionTargetsCursor.GetItemHealth calls super.GetItemHealth() only on some paths — on the others the chain below this mod is dropped. DayOne.pbo::5_Mission\GUI\ActionTargetCursor.c:58
- PlayerBase.CheckLiftWeapon calls super.CheckLiftWeapon() only on some paths — on the others the chain below this mod is dropped. DayOne.pbo::4_World\Entities\ManBase\PlayerBase.c:24
- ActionDigGardenPlot.ActionCondition vetoes early (returns false) on some paths and defers to super.ActionCondition() otherwise — composes safely with vanilla's and earlier mods' conditions. DayOne.pbo::4_World\Classes\UserActionsComponent\Action\Continuous\ActionDigGardenPlot.c:3
Checks answered without super() · 3 · warning
- DayZPlayerImplement.IsShootingFromCamera returns its own answer without consulting super.IsShootingFromCamera() — vanilla's conditions on this check, and those of every earlier-loaded mod, no longer apply. Intended when a mod owns the rule outright; otherwise it is how another mod's restriction quietly stops working. DayOne.pbo::4_World\Entities\DayZPlayerImplement.c:3
- Land_FuelStation_Feed.HasFuelToGive returns its own answer without consulting super.HasFuelToGive() — vanilla's conditions on this check, and those of every earlier-loaded mod, no longer apply. Intended when a mod owns the rule outright; otherwise it is how another mod's restriction quietly stops working. DayOne.pbo::4_World\Entities\Building\Specific\Land_FuelStation_Feed.c:13
- land_fuelstation_w_feed.HasFuelToGive returns its own answer without consulting super.HasFuelToGive() — vanilla's conditions on this check, and those of every earlier-loaded mod, no longer apply. Intended when a mod owns the rule outright; otherwise it is how another mod's restriction quietly stops working. DayOne.pbo::4_World\Entities\Building\Specific\Land_FuelStation_Feed.c:46

What this report can tell you

Which vanilla methods the mod hooks, which of them drop the chain, how often each hook fires, and which risky calls sit inside hot hooks.

What it cannot

How long hook bodies take, network cost, or engine-side load. Measured across live fleets, most server lag comes from the engine and world state, not mod script chains — a light footprint does not clear a mod of lag, and a heavy one does not convict it. Methodology.

Everything else

All 61 overrides

Surface is the dispatch tier the rubric can price (— = unpriced); server is whether the override exists on a dedicated server; super() shows whether the vanilla chain is preserved on a server.

method	surface	server	super()	where
`ActionConstructor.RegisterActions`	—	yes	✓	`DayOne.pbo::4_World\Classes\UserActionsComponent\ActionConstructor.c:3`
`ActionDigGardenPlot.ActionCondition`	T2	yes	conditional	`DayOne.pbo::4_World\Classes\UserActionsComponent\Action\Continuous\ActionDigGardenPlot.c:3`
`ActionEatMeat.OnEndServer`	—	yes	✓	`DayOne.pbo::4_World\Classes\UserActionsComponent\Action\Continuous\ActionEatMeat.c:3`
`ActionForceFeedMeat.OnEndServer`	—	yes	✓	`DayOne.pbo::4_World\Classes\UserActionsComponent\Action\Continuous\ActionForceFeedMeat.c:3`
`ActionTargetsCursor.GetItemDesc`	—	yes	conditional	`DayOne.pbo::5_Mission\GUI\ActionTargetCursor.c:44`
`ActionTargetsCursor.GetItemHealth`	—	yes	conditional	`DayOne.pbo::5_Mission\GUI\ActionTargetCursor.c:58`
`ActionTargetsCursor.GetItemCargoCount`	—	yes	conditional	`DayOne.pbo::5_Mission\GUI\ActionTargetCursor.c:72`
`BandageDressing.InitItemVariables`	—	yes	✓	`DayOne.pbo::4_World\Entities\ItemBase\BandageDressing.c:3`
`BrainDiseaseMdfr.OnTick`	—	yes	✗ none	`DayOne.pbo::4_World\Classes\PlayerModifiers\Modifiers\Diseases\BrainDisease.c:8`
`CAContinuousFillCoolant.CalcAndSetQuantity`	—	yes	✗ none	`DayOne.pbo::4_World\Classes\UserActionsComponent\ActionComponents\CAContinuousFillCoolant.c:3`
`CraftFenceKit.CanDo`	—	yes	✓	`DayOne.pbo::4_World\Classes\Recipes\Recipes\CraftFenceKit.c:3`
`CraftSuppressor.Init`	—	yes	✗ none	`DayOne.pbo::4_World\Classes\Recipes\Recipes\CraftSuppressor.c:3`
`CraftTerritoryFlagKit.CanDo`	—	yes	✓	`DayOne.pbo::4_World\Classes\Recipes\Recipes\CraftTerritoryFlagKit.c:3`
`CraftWatchtowerKit.CanDo`	—	yes	✓	`DayOne.pbo::4_World\Classes\Recipes\Recipes\CraftWatchtowerKit.c:3`
`DayZGame.OnAfterCreate`	—	yes	✓	`DayOne.pbo::3_Game\DayZGame.c:9`
`DayZPlayerImplement.IsShootingFromCamera`	—	yes	✗ none	`DayOne.pbo::4_World\Entities\DayZPlayerImplement.c:3`
`DayZPlayerImplement.ModCommandHandlerAfter`	—	yes	✓	`DayOne.pbo::4_World\Entities\DayZPlayerImplement.c:8`
`ElectronicRepairKit.InitItemVariables`	—	yes	✓	`DayOne.pbo::4_World\Entities\ItemBase\ElectronicRepairKit.c:3`
`ExplosionTest.ExplodeNow`	—	yes	✗ none	`DayOne.pbo::4_World\Classes\Explosion.c:7`
`Grenade_Base.OnExplode`	—	yes	✓	`DayOne.pbo::4_World\Entities\ItemBase\Grenade_Base.c:189`
`Grenade_Base.Activate`	—	yes	✓	`DayOne.pbo::4_World\Entities\ItemBase\Grenade_Base.c:205`
`Grenade_Base.OnInventoryExit`	T2	yes	✓	`DayOne.pbo::4_World\Entities\ItemBase\Grenade_Base.c:215`
`Grenade_Base.OnInventoryEnter`	T2	yes	✓	`DayOne.pbo::4_World\Entities\ItemBase\Grenade_Base.c:227`
`Grenade_Base.EEItemLocationChanged`	T2	yes	✓	`DayOne.pbo::4_World\Entities\ItemBase\Grenade_Base.c:234`
`Grenade_Base.ProcessImpactSound`	—	yes	✗ none	`DayOne.pbo::4_World\Entities\ItemBase\Grenade_Base.c:249`
`Grenade_Base.EOnContact`	—	yes	✓	`DayOne.pbo::4_World\Entities\ItemBase\Grenade_Base.c:255`
`Grenade_Base.OnVariablesSynchronized`	T2	yes	✓	`DayOne.pbo::4_World\Entities\ItemBase\Grenade_Base.c:268`
`Heatpack.OnWorkStart`	—	yes	✗ none	`DayOne.pbo::4_World\Entities\ItemBase\Heatpack.c:3`
`Heatpack.OnWork`	—	yes	✗ none	`DayOne.pbo::4_World\Entities\ItemBase\Heatpack.c:11`
`JMAnimRegister.RegisterTwoHanded`	—	yes	✓	`DayOne.pbo::4_World\Animations.c:3`
`Land_FuelStation_Feed.EEKilled`	T3	yes	✗ none	`DayOne.pbo::4_World\Entities\Building\Specific\Land_FuelStation_Feed.c:5`
`Land_FuelStation_Feed.OnExplosionEffects`	—	yes	✗ none	`DayOne.pbo::4_World\Entities\Building\Specific\Land_FuelStation_Feed.c:9`
`Land_FuelStation_Feed.HasFuelToGive`	—	yes	✗ none	`DayOne.pbo::4_World\Entities\Building\Specific\Land_FuelStation_Feed.c:13`
`land_fuelstation_w_feed.EEKilled`	T3	yes	✗ none	`DayOne.pbo::4_World\Entities\Building\Specific\Land_FuelStation_Feed.c:38`
`land_fuelstation_w_feed.OnExplosionEffects`	—	yes	✗ none	`DayOne.pbo::4_World\Entities\Building\Specific\Land_FuelStation_Feed.c:42`
`land_fuelstation_w_feed.HasFuelToGive`	—	yes	✗ none	`DayOne.pbo::4_World\Entities\Building\Specific\Land_FuelStation_Feed.c:46`
`LeatherSewingKit.InitItemVariables`	—	yes	✓	`DayOne.pbo::4_World\Entities\ItemBase\LeatherSewingKit.c:3`
`MainMenu.LoadMods`	—	yes	✓	`DayOne.pbo::5_Mission\GUI\NewUI\MainMenu.c:3`
`MainMenu.DF_DisablePatreon`	—	yes	✗ none	`DayOne.pbo::5_Mission\GUI\NewUI\MainMenu.c:13`
`MissionGameplay.OnInit`	T3	yes	✓	`DayOne.pbo::5_Mission\Mission\MissionGameplay.c:10`
`MissionGameplay.OnEvent`	—	yes	conditional	`DayOne.pbo::5_Mission\Mission\MissionGameplay.c:43`
`MissionGameplay.OnUpdate`	T0	yes	✓	`DayOne.pbo::5_Mission\Mission\MissionGameplay.c:130`
`MissionServer.OnInit`	T3	yes	✓	`DayOne.pbo::5_Mission\Mission\MissionServer.c:5`
`MissionServer.InvokeOnConnect`	T3	yes	✓	`DayOne.pbo::5_Mission\Mission\MissionServer.c:16`
`ModItemRegisterCallbacks.RegisterOneHanded`	—	yes	✓	`DayOne.pbo::4_World\Entities\Grenade_Base\M18SmokeGrenade_ColorBase.c:101`
`PlayerBase.Init`	—	yes	✓	`DayOne.pbo::4_World\Entities\ManBase\PlayerBase.c:6`
`PlayerBase.OnPlayerLoaded`	—	yes	✓	`DayOne.pbo::4_World\Entities\ManBase\PlayerBase.c:14`
`PlayerBase.CheckLiftWeapon`	—	yes	conditional	`DayOne.pbo::4_World\Entities\ManBase\PlayerBase.c:24`
`PlayerBase.SetActions`	T2	yes	✓	`DayOne.pbo::4_World\Entities\ManBase\PlayerBase.c:64`
`PlayerBase.SetActionsRemoteTarget`	—	yes	✓	`DayOne.pbo::4_World\Entities\ManBase\PlayerBase.c:73`
`PlayerBaseClient.OnVariablesSynchronized`	T2	yes	✓	`DayOne.pbo::4_World\Entities\ManBase\PlayerBaseClient.c:5`
`PlayerBaseClient.OnStanceChange`	—	no	✓	`DayOne.pbo::4_World\Entities\ManBase\PlayerBaseClient.c:32`
`PlayerBaseClient.OnMovementChanged`	—	no	✓	`DayOne.pbo::4_World\Entities\ManBase\PlayerBaseClient.c:40`
`PlayerBaseClient.OnInventoryMenuOpen`	—	no	✓	`DayOne.pbo::4_World\Entities\ManBase\PlayerBaseClient.c:48`
`PlayerBaseClient.OnInventoryMenuClose`	—	no	✓	`DayOne.pbo::4_World\Entities\ManBase\PlayerBaseClient.c:56`
`PlayerBaseClient.ModCommandHandlerBefore`	—	no	✓	`DayOne.pbo::4_World\Entities\ManBase\PlayerBaseClient.c:64`
`PlayerBaseClient.ModCommandHandlerAfter`	—	no	✓	`DayOne.pbo::4_World\Entities\ManBase\PlayerBaseClient.c:80`
`PluginRecipesManagerBase.RegisterRecipies`	—	yes	✓	`DayOne.pbo::4_World\Classes\Recipes\Recipes\PluginRecipesManagerBase.c:3`
`SewingKit.InitItemVariables`	—	yes	✓	`DayOne.pbo::4_World\Entities\ItemBase\SewingKit.c:3`
`TireRepairKit.InitItemVariables`	—	yes	✓	`DayOne.pbo::4_World\Entities\ItemBase\TireRepairKit.c:3`
`WeaponCleaningKit.InitItemVariables`	—	yes	✓	`DayOne.pbo::4_World\Entities\ItemBase\WeaponCleaningKit.c:3`

Dispatch surfaces and timers the grade prices

surface	tier	rate (Hz)	rate source	ms/s
`Grenade_Base.OnInventoryExit`	T2	130.0	measured	0.0032
`Grenade_Base.OnInventoryEnter`	T2	130.0	measured	0.0032
`Grenade_Base.EEItemLocationChanged`	T2	130.0	measured	0.0032
`ActionDigGardenPlot.ActionCondition`	T2	8.0	placeholder	0.0002
`Grenade_Base.OnVariablesSynchronized`	T2	8.0	placeholder	0.0002
`PlayerBase.SetActions`	T2	8.0	placeholder	0.0002
`PlayerBaseClient.OnVariablesSynchronized`	T2	8.0	placeholder	0.0002
`Land_FuelStation_Feed.EEKilled`	T3	0.1	placeholder	0.0000
`land_fuelstation_w_feed.EEKilled`	T3	0.1	placeholder	0.0000
`MissionServer.OnInit`	T3	0.1	placeholder	0.0000
`MissionServer.InvokeOnConnect`	T3	0.1	placeholder	0.0000

Repeating timers

period (ms)	residency ms/s	firing ms/s	where
20	0.1400	0.001240	`DayOne.pbo::5_Mission\Mission\EarplugsWidget.c:54`

Includes 0.001 ms/s from placeholder-rated surfaces.

Load-order constraints (CfgPatches)

What each PBO declares: its addon identity and the addons it requires to be loaded first (requiredAddons). A partial load-order signal from the mod's own metadata.

DayOne.pbo

DO_BearHeaddress requiredVersion 0.1 — requires DZ_Data
DO_BoneHatchet requiredVersion 0.1 — requires DZ_Data, DZ_Weapons_Melee
DO_BoneKnife requiredVersion 0.1 — requires DZ_Data, DZ_Weapons_Melee
DO_CamoNetPoncho requiredVersion 0.1 — requires DZ_Data, DZ_Characters
DayOne requiredVersion 0.1 —
requires 21 addons
DZ_Animals_ursus_arctos, DZ_Animals, DZ_Characters_Backpacks, DZ_Data, DZ_Gear_Consumables, DZ_Gear_Crafting, DZ_Gear_Food, DZ_Gear_Tools, DZ_Scripts, DZ_Sounds_Bliss, DZ_Sounds_Effects, DZ_Vehicles_Wheeled, DZ_Weapons_Lights, DZ_Weapons_Projectiles, JM_CF_Scripts, DO_BearHeaddress, DO_BoneHatchet, DO_BoneKnife, DO_SprayPaint, DO_WolfHeaddress, DO_CamoNetPoncho
DO_SprayPaint requiredVersion 0.1 — requires DZ_Data, DZ_Gear_Consumables, DZ_Characters_Backpacks, DZ_Characters_Vests, DZ_Weapons_Supports, DZ_Gear_Containers
DO_WolfHeaddress requiredVersion 0.1 — requires DZ_Data

census 1.1 · findings 1.1 · hash 89cd0b320c82d3a2