Heartbeat and PostSimulation have the same exact description

[Johnny_D3pp (Nik_REAL)]

Heartbeat and PostSimulation events both have the same description, I’m not sure if they do the same thing but I feel like this is too confusing for people casually reading the documentation.

Page URL: https://create.roblox.com/docs/reference/engine/classes/RunService#Heartbeat

[thirdtakeonit]

Thanks for the report! I filed a ticket in our internal database.

[hellohennessy (Nameless)]

PostSimulation is meant to be a replacement for Heartbeat.
The reason is probably to have a more sleek naming convention.

[IgnisRBX]

Hi all,
We appreciate the reports! I’ve updated the RunService page to be clearer on all of these events and when they happen in the scheduler cycle; some new ones are exact equivalents of previous ones, but not in every case… the docs now should clarify those equivalents.

RunService | Documentation - Roblox Creator Hub

At a high level:

1. PreRender (RenderStepped)
2. PreAnimation (new)
3. PreSimulation (Stepped)
4. PostSimulation (new)
5. Heartbeat

Take care,
IgnisRBX

[IgnisRBX]

Hi @PeZsmistic,
Please see my response above, as it’s a bit more nuanced with the “new” events vs. the previous ones.

IgnisRBX

[IgnisRBX]

Hi @hellohennessy ,
Please see my post above. It’s a bit more nuanced and PostSimulation doesn’t replace Heartbeat 1:1.

IgnisRBX

[JohnPlayzRoblox421 (KV2)]

Hello! Upon further inspection using the microprofiler, this is the actual ordering of the events (order is the same on all frames):

1. RenderStepped
2. PreRender
3. PreAnimation
4. Stepped
5. PreSimulation
6. Heartbeat
7. PostSimulation
   
   
   
   (for some reason PostSimulation is named queryPoint in the microprofiler, but anyway)

This is the LocalScript I used to record them:

local RunService = game:GetService("RunService")

local function logevent(eventName)
	debug.profilebegin(eventName)
	for i = 1, 10000 do local a = Random.new():NextUnitVector() * math.random(100) end -- extra work to lengthen the frame time
	debug.profileend()
end

RunService.PreRender:Connect(function()
	logevent("PreRenderEvent")
end)

RunService.RenderStepped:Connect(function()
	logevent("RenderSteppedEvent")
end)

RunService.PreAnimation:Connect(function()
	logevent("PreAnimationEvent")
end)

RunService.PreSimulation:Connect(function()
	logevent("PreSimulationEvent")
end)

RunService.Stepped:Connect(function()
	logevent("SteppedEvent")
end)

RunService.Heartbeat:Connect(function()
	logevent("HeartbeatEvent")
end)

RunService.PostSimulation:Connect(function()
	logevent("PostSimulationEvent")
end)

edit: wrong reply, just wanted to add some extra information and context

[Johnny_D3pp (Nik_REAL)]

Thanks Ignis! I appreciate you taking the time to look into this issue, take care!