topic Re: Constant High CPU Usage on HP/Windows 11 Laptop in Fusion Support Forum

Constant High CPU Usage on HP/Windows 11 Laptop

mbrady4597 — Tue, 28 Jun 2022 03:30:21 GMT

I am having an issue with Fusion 360 constantly overloading a single core on my computer and occasionally all the cores, leading to overheating when plugged in and overly fast battery discharge if not. I have an HP spectre with a quad core 11th gen i7 cpu. Running windows 11. Everything is up to date, windows and fusion. When I first open fusion 360 everything seems fine. I can open project files and cpu usage is normal and is minimal when not clicking or doing anything within the application window. But after some time, the cpu usage goes up to around 20-25% and stays there and won't decrease unless I close the program completely. This can't be normal to constantly run a core near 100%, especially when not doing anything in the program. Doesn't matter if it's open or minimized. I've also had the problem occur after rendering where the cpu will increase to 100% to render and then after rendering is complete, the cpu usage won't decrease. It just stays up around 100%.

Surely this can't be normal. Looking for any ideas or tips, or maybe it's a software issue that needs to be fixed. I don't want a premature fan failure from constantly running at max power and it's getting annoying constantly have to check my laptop's cpu usage and temperature to see if I need to restart fusion 360.

Re: Constant High CPU Usage on HP/Windows 11 Laptop

TheCADWhisperer — Tue, 28 Jun 2022 11:52:11 GMT

Can you File>Export your *.f3d (or *.f3z) file to your local drive and then Attach it here to a Reply?

Are there any unresolved issues highlighted in your timeline?

Have you used optimal modeling techniques (no sketch patterns)?

Re: Constant High CPU Usage on HP/Windows 11 Laptop

mbrady4597 — Wed, 29 Jun 2022 18:37:53 GMT

Do the mentioned problems cause high cpu use even when fusion is idle in the background? That doesn't make sense to me. I've attached my file.

There may be a few times I used sketch patterns. I did not realize this was a poor technique. No unresolved issues in timeline though.

I also was not able to replicate the issue while on battery power yesterday. This may have been a coincidence because I wasn't using it all that long or maybe it has something to do with my laptop's performance management preventing the high cpu load processes while on battery power?

Re: Constant High CPU Usage on HP/Windows 11 Laptop

mbrady4597 — Wed, 29 Jun 2022 18:40:00 GMT

It would be nice to know common causes of high cpu use, whether while modeling or when fusion is just running in the background. That way I could try to avoid the issue if possible.

Re: Constant High CPU Usage on HP/Windows 11 Laptop

TrippyLighting — Wed, 29 Jun 2022 19:22:35 GMT

@mbrady4597 wrote:
... No unresolved issues in timeline though...

I ran a "Modify->Compute all" and there indeed a few unresolved issues in the timeline afterwards. My guess is, however, that:

1. They should be easy to fix and

2. They should not cause the problems you are describing.

I do see a couple of areas that could improve the general performance of the assembly , but those also should not cause the issues you are describing.

Before creating sketches ad bodies for a new, discrete part, e.g. the actual duct, you should create a new component and activate it. Here's a reference to Fusion 360 R.U.L.E #1
In an assembly design with a timeline, don't use the move and align tool followed by a position capture and rigid group to assemble an entire sub-assembly. The position capture feature should generally be limited or completely be avoided in timeline based assembly designs.

Re: Constant High CPU Usage on HP/Windows 11 Laptop

mbrady4597 — Wed, 29 Jun 2022 19:54:28 GMT

Thanks for the quick reply and the link to the rules 1 and 2. Hopefully I can clean up my workflow. I’ll keep testing to see if I can isolate the specific conditions that are causing my issue.