Forum Discussion

Re: Poor performance and low GPU usage.

CPU around 25-30% OVERALL doesn't mean that it is not bottlenecking your GPU. You have to look at utilization of the individual cores to check for a CPU bottleneck.

Doesn't mean the game should not be further optimized, it's just a common misconception to only look at overall CPU utilization instead of core utilization when looking for a CPU bottleneck.

17 Replies

  • RaceOwl87's avatar
    RaceOwl87
    Rising Rookie
    2 years ago

    That's up to the developers and their implementation of the game / engine.

  • Astramus's avatar
    Astramus
    2 years ago
    @RaceOwl87 Hello, you're right, but I know what I'm talking about, I've been assembling gaming PCs for 25 years, I even do projects for manufacturers and in this case each core does not exceed 30% of use. Plus, it's the only game that happens to me. I have much more demanding games, and my GPU works at 100% without problem. It seems that the optimization problem is in the reflection of the cars. When you lower it, the GPU increases its usage although it still does not reach 100%. It is not something isolated to me, it happens to many people even with RTX 4090 and a Ryzen 7800X3D or an i9-13900K. You can look at it in other forums. It's an optimization error. Thanks for your answer.
  • RaceOwl87's avatar
    RaceOwl87
    Rising Rookie
    2 years ago

    @AstramusThanks for clarifying! Just wanted to make sure because many people on the internet just don't understand bottlenecking at all. Good to hear that you are not one of them. 🙂
    Do you get 100% GPU utilization in menus and pause screens though? That's what I'm getting. GPU usage only drops when I'm on a rally stage. Even in Rally School, I get 99% GPU usage, but never in a normal stage.
    Definitely a serious bug that should be fixed asap.
    5800X3D + 7900 XTX here btw.

  • Astramus's avatar
    Astramus
    2 years ago

    Hello, exactly the same thing happens to me as you. In menus the GPU reaches 100% perfectly (well, not always, but it is used much more) and obviously, in menus I even have 230FPS on some occasions. The drop in performance only happens to me in the stages. Only occasionally at some stage I get 100% for a couple of seconds but it fluctuates again. With the new patch the stuttering has improved, but unfortunately it remains the same. 32GB DDR4 3600MHz, i7-8086K @ 5GHz, the game installed in a Samsung NVMe 970 and my GPU is an RTX 4070.


    @RaceOwl87  ha escrito:

    @AstramusThanks for clarifying! Just wanted to make sure because many people on the internet just don't understand bottlenecking at all. Good to hear that you are not one of them. 🙂
    Do you get 100% GPU utilization in menus and pause screens though? That's what I'm getting. GPU usage only drops when I'm on a rally stage. Even in Rally School, I get 99% GPU usage, but never in a normal stage.
    Definitely a serious bug that should be fixed asap.
    5800X3D + 7900 XTX here btw.


  • Astramus's avatar
    Astramus
    2 years ago
    @RaceOwl87 Hello, yesterday testing the WRC, by chance I discovered that it is indeed an optimization error. I tell you, yesterday I started playing Rally School and I realized, that in that part of the game, it stutters sometimes, but the GPU usage increases to 90~100% and the FPS increases to 110~155 while CPU cores remain between 30~55% usage. Everything works correctly in the Rally school (except the occasional micro stutters) So I can confirm that the failure is in the stages.
  • I can also confirm the low CPU and, particularly, the low GPU usage during stages. Despite the very demanding scenarios (e.g., Finland, where some stages range from 90 fps to 60 fps in just one corner), GPU usage never reaches 100%.

    These numbers point to a problem with UE4 code optimization, since hardware resources are never fully utilized and, as a consequence, performance is severely compromised.

    My PC specifications include a AMD 5600x, 32Gb of RAM and AMD 6800XT (XFX Merc 918).

  • @Astramus something is definitely wrong there limiting you. Cos I'm getting up to 75% single core usage on a higher performance CPU (5800x3d)
  • Astramus's avatar
    Astramus
    2 years ago

    @JG-skinny-racer There are users like you who are lucky and it works well for them with their hardware configuration, and others for whom it does not work correctly. Clarify that what I said before should not be a matter of luck. It is not a question of an isolated error or failure since it happens to many users. A game should work correctly on any computer as long as you have the appropriate specifications or even in my case, for example, I have higher specifications to be able to run the game with ultra settings at 1440p. Thanks for your response and greetings. 


    @JG-skinny-racer  ha escrito:
    @Astramussomething is definitely wrong there limiting you. Cos I'm getting up to 75% single core usage on a higher performance CPU (5800x3d)
  • Agreed it is very odd that users are seeing such varying issues. Although i am capable of running reasonable frame rates, i also get a lot of stuttering especially on the first run as if the shader patch did not quite work, compared to others. All graphics settings except DLSS result in a blurry mess.

    It makes it difficult to diagnose the issues when they are so different for everyone

  • POW18's avatar
    POW18
    2 years ago
    @JG-skinny-racer Same on AMD.
    FSR on quality or even balanced looks better than native with some sharpening. Native looks very blurry.

    Turning car reflections and shadows to ultra low, does make it a fair bit better with the stuttering.
  • chasco69's avatar
    chasco69
    2 years ago

    With that CPU and that gpu u are bottlenecking CPU for sure... The game dont have the fault, maybe its poorly optimized than other and for that its more noticeable than on other games but u have to much GPU for that CPU.

  • No mate. I have been in the world of gaming for 25 years and I know exactly what the bottleneck is, and it is quite a myth. My processor runs around 35~45% on each core and if we try it in more demanding games I don't have a single problem. I repeat, the bottleneck exists but not always. A CPU that has 6 cores and 12 threads at 5GH can handle a 4070 and something else. Also, if you read more users you will see that there are people with the same problem with much more powerful CPUs than mine. Greetings. 


    @chasco69  ha escrito:

    With that CPU and that gpu u are bottlenecking CPU for sure... The game dont have the fault, maybe its poorly optimized than other and for that its more noticeable than on other games but u have to much GPU for that CPU.


  • Hello everyone. I have installed the new 1.3.0 patch and the GPU usage problem has been completely solved, at least for me. In all stages, my GPU runs between 95~100% constantly and the cores of my i7-8086k do not exceed 45% usage. I also dedicate this to everyone who said that an RTX 4070 is bottlenecking the CPU (too much GPU for that CPU) is what they said. Well, everything works much better, but there are stages, like Kenya for example, where the FPS continues to drop and does not stay above 60 at some points of the stage (normally they are around 90FPS). The average FPS in 1440p with everything in ultra except the reflections of the car which are low, now I have them at 90~120FPS. Greetings.