Assetto Corsa

Assetto Corsa

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ac lagging even at high-end pc
so i just bought ac couple of hours ago, and i checked the recommended system requirements, and it SHOULD be running fine at highest setting. i can play forza horizon 4 at high setting with 60 fps no drops, and nfs heat smoothly, but with this game, it's lagging even at medium setting. i dont understand.. at the first time i play this game, i immediately run benchmark mode and it's 100+ fps i believe it was on high setting. i decided to race in career mode and it's lagging as heck. i tried to restart my computer, clearing all unused tasks and stuff, then start ac again, at first 5 mins it runs smoothly but after that there's warning that says "cpu > 99%" and the game is lagging AGAIN. i decided to quit the game and return to my desktop and open my task manager, no high cpu app detected. is there any ways i can fix this? help/suggestion is greatly appreciated. thanks :)
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Showing 1-13 of 13 comments
The CPU Warning > 99% is an engine warning, which most probably means that your PC (CPU) is not able to run the simulation at real time (which is obviously not good for a physics simulator).

There was a topic about it here.
https://steamcommunity.com/app/244210/discussions/0/3112518479595762490/
Last edited by 🉑 rezno[R].technology; Feb 13, 2021 @ 3:46am
evanchristianto Feb 15, 2021 @ 2:00am 
Originally posted by 🉑 reznoR:
The CPU Warning > 99% is an engine warning, which most probably means that your PC (CPU) is not able to run the simulation at real time (which is obviously not good for a physics simulator).

There was a topic about it here.
https://steamcommunity.com/app/244210/discussions/0/3112518479595762490/
i think that's kinda weird because i always closed all unecessary task before playing any game, and i was looking at the system requirements for this game, and this game should be running fine even at highest setting.

My pc spec
Intel(R) Core(TM) i7 CPU-870 @2.93GHz
16 GB RAM
NVIDIA Geforce 1050 Ti
Latest windows version
If the same warning happens when you decrease every setting to minimum and even after doing what the post link above advises, then I would suggest going to official Kunos forums and creating a thread about it. This issue seems sometimes unique to someone's hardware. Even people with much higher specs may have it. I personally never had this warning, for example.

AC's hardware requirements depend on the graphics settings used, track played, mods used and amount of AI cars on the track. This is not just a spec issue, it gets complicated and more taxing on the CPU the more things you enable.

To test this, play alone on a short, simple empty track on the lowest graphics settings with all Post Processing, Shadows, Effects, Particles etc. turned off. And see if you have the warning then as well.
Last edited by 🉑 rezno[R].technology; Feb 15, 2021 @ 3:31am
evanchristianto Feb 15, 2021 @ 3:41am 
Originally posted by 🉑 reznoR:
If the same warning happens when you decrease every setting to minimum and even after doing what the post link above advises, then I would suggest going to official Kunos forums and creating a thread about it. This issue seems sometimes unique to someone's hardware. Even people with much higher specs may have it. I personally never had this warning, for example.

AC's hardware requirements depend on the graphics settings used, track played, mods used and amount of AI cars on the track. This is not just a spec issue, it gets complicated and more taxing on the CPU the more things you enable.

To test this, play alone on a short, simple empty track on the lowest graphics settings with all Post Processing, Shadows, Effects, Particles etc. turned off. And see if you have the warning then as well.
hi thanks for your suggestions, i already did sent message to the dev, and also it seems that i have the cpu warning only once. anyway about the gameplay, i decided to tweak everything, and sometimes the game smooth (lowest setting obv) but sometimes the game shutters and lagging (lowest setting), i literally have no idea how to fix that, I've tried change the game priority to high but nothing happened. also when i tried benchmark test in high setting, it's so smooth and i had like 11000+ points but when racing, it's lagging as heck. idk if this problem doesn't get fixed i think imma get a refund
Artan Feb 15, 2021 @ 10:06am 
Side thought.

That is a very old CPU - released 2009. What cooler are you using? If it is the standard Intel boxed cooler have you ever cleaned out the heatsink in all the years its been in operation?

The standard Intel boxed fan cooler gets very built up with compacted dust over time and you may find that AC provides more load to your CPU than anything else you are running and that it leads to temp issues and CPU throttling. I run an i7 4770k on a closed loop water cooler at home and get no temp issues - however at work run a 2nd gen i5 with the standard Intel boxed fan and it has been installed and not cleaned in a very long time.

One time last year - the CPU got very hot under load and was throttling and as I a temp monitor, I noticed and so did the clear out. I was shocked at how much dust there was and how compacted into the heatsink it had gotten. Had it not happened I wouldn't have believed it could have been that bad!

If you do not already it would be worth running some CPU temp monitor like Core temp and then checking the temps your getting when the stuttering begins.:

https://www.alcpu.com/CoreTemp/

Originally posted by 🉑 reznoR:
also when i tried benchmark test in high setting, it's so smooth and i had like 11000+ points but when racing, it's lagging as heck. idk if this problem doesn't get fixed i think imma get a refund

In a race with lots of other AI opponents - this is CPU intensive task as those drivers are all putting load on the CPU. As this is a sim and not NFS arcade etc there is a lot for your CPU to do as it has to perform all the simulation calculations and the more opponents = much more to calculate! If your CPU is having any temp issues this will make it struggle and cause stutters because of the load that is placed on a CPU running a race with many opponents.

By contrast, fancy graphics will be handled by your GPU and not the CPU and so a Graphical benchmark might not place the same load on the CPU as the race scenario. NFS being not a simulator will have far less CPU load and a lot more GPU load and might not be putting enough load on the CPU to cause any issue.

As such what you describe really makes me think you might be having issue when your CPU is under load and not any issues with your GPU. Your CPU might not overheat under medium load and this might be the case for your day to day task and other games. It might be that only a race in AC is putting the load on the CPU that means it needs to run a high fan speed to keep cool and if the heatsink is clogged - this exact scenario may be causing throttling.

I might be barking up the wrong tree - however I would check this and rule out CPU temps before seeking support from the devs!

Good luck!
Last edited by Artan; Feb 15, 2021 @ 10:19am
evanchristianto Feb 15, 2021 @ 4:06pm 
Originally posted by QuinnMeisterGeneral:
Side thought.

That is a very old CPU - released 2009. What cooler are you using? If it is the standard Intel boxed cooler have you ever cleaned out the heatsink in all the years its been in operation?

The standard Intel boxed fan cooler gets very built up with compacted dust over time and you may find that AC provides more load to your CPU than anything else you are running and that it leads to temp issues and CPU throttling. I run an i7 4770k on a closed loop water cooler at home and get no temp issues - however at work run a 2nd gen i5 with the standard Intel boxed fan and it has been installed and not cleaned in a very long time.

One time last year - the CPU got very hot under load and was throttling and as I a temp monitor, I noticed and so did the clear out. I was shocked at how much dust there was and how compacted into the heatsink it had gotten. Had it not happened I wouldn't have believed it could have been that bad!

If you do not already it would be worth running some CPU temp monitor like Core temp and then checking the temps your getting when the stuttering begins.:

https://www.alcpu.com/CoreTemp/

Originally posted by 🉑 reznoR:
also when i tried benchmark test in high setting, it's so smooth and i had like 11000+ points but when racing, it's lagging as heck. idk if this problem doesn't get fixed i think imma get a refund

In a race with lots of other AI opponents - this is CPU intensive task as those drivers are all putting load on the CPU. As this is a sim and not NFS arcade etc there is a lot for your CPU to do as it has to perform all the simulation calculations and the more opponents = much more to calculate! If your CPU is having any temp issues this will make it struggle and cause stutters because of the load that is placed on a CPU running a race with many opponents.

By contrast, fancy graphics will be handled by your GPU and not the CPU and so a Graphical benchmark might not place the same load on the CPU as the race scenario. NFS being not a simulator will have far less CPU load and a lot more GPU load and might not be putting enough load on the CPU to cause any issue.

As such what you describe really makes me think you might be having issue when your CPU is under load and not any issues with your GPU. Your CPU might not overheat under medium load and this might be the case for your day to day task and other games. It might be that only a race in AC is putting the load on the CPU that means it needs to run a high fan speed to keep cool and if the heatsink is clogged - this exact scenario may be causing throttling.

I might be barking up the wrong tree - however I would check this and rule out CPU temps before seeking support from the devs!

Good luck!
thankyou! definitely gonna look that up!
lx Feb 19, 2021 @ 1:48pm 
i have bad visuals, if i dont use vsync. jumpy and stuttery.
my hardware is about the same.
try vsync on and maybe limit framerate to display refresh. (✔️; 60)

thats not lagging, though. maybe your issue is different.
jacowin Feb 20, 2021 @ 1:46am 
I had this problem to start with. The first few races fine and then the cpu would get hot, start throttling and all would slow down, I reduced fps to 35 and its now all buttery smooth and running all on max with sol, content manager and csp installed. To me asseto corsa is simply the best!
Originally posted by jacowin:
I had this problem to start with. The first few races fine and then the cpu would get hot, start throttling and all would slow down, I reduced fps to 35
You can always look more closely into the thermal throttling issue. After some time of normal PC usage, it is required to do a bit of simple hardware maintenance to keep it running healthy again:
https://www.howtogeek.com/72716/how-to-thoroughly-clean-your-dirty-desktop-computer/
Basically dusting and thermal paste replacement. If you don't feel well with doing it yourself, you can always hire someone else to do it for you. This will bring your PC to top shape again so you won't have to reduce the fps limit, and the CPU will stop thermal throttling.

Also do make sure that your PC is in a spot where it can "breathe" freely, and the airflow is not blocked in some way.
Last edited by 🉑 rezno[R].technology; Feb 20, 2021 @ 2:44am
lx Feb 20, 2021 @ 3:54am 
yes, throttle is there to protect from abnormal operation. even at 100% usage, it should work at nominal. there is something wrong with it.
jacowin Feb 20, 2021 @ 5:58am 
I think half of my problem is that I'm using a laptop so heat can be a problem. I think a service maybe in order though. Since lowering fps I have had no problems though. I'm new to all of this so all a learning curve. Desktop is deffinetly the way forward for serious gaming.
lx Feb 20, 2021 @ 6:01am 
probably its very dusty and it needs cleaning then.
its not hard to do it yourself. just make sure you have no static electricity on yourself and you can reassemble it properly.
no spare parts left :D
If a laptop worked fine when was new, then it should work as new (or even better) after basic maintenance.

Laptops are a bit more prone to such things due to their mobile nature. So they may require doing some maintenance more often than PCs, like maybe ~1 time a year. It also depends very much on the environment they are being used in.
Last edited by 🉑 rezno[R].technology; Feb 20, 2021 @ 6:16pm
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Date Posted: Feb 13, 2021 @ 2:28am
Posts: 13