topic Re: Fusion not Fully Utilizing CPU or RAM in Fusion Support Forum

Fusion not Fully Utilizing CPU or RAM

bigradben — Thu, 06 Apr 2023 22:12:41 GMT

I'm running into significant performance issues trying to nest parts. I'm nesting about 60 unique parts on a 5 X 10 sheet, and it takes between 10 and 20 minutes to compute. While this is running Fusion rarely gets above roughly 25% usage of the CPU or RAM. All 8 cores are being used about equally. The GPU is around 1%. The PC has an i7-11700 processor, 36G of RAM, and an NVIDIA graphics card.

It's taking so long to nest components that it's limiting production. Ideally I'd like to nest closer to 400 parts at a time. The parts are simple arcs and rectangles, I'd rather not share the nesting files, but I'll attach a sample part.(Note I'm not nesting the same part 60 times, I'm nesting 60 similar but unique parts.) I'm allowing 5 degrees of rotation, reducing that to 10 improves performance a little, but it's still slow. I'd like to keep the rotation at 5 degrees so I can use material more efficiently.

Re: Fusion not Fully Utilizing CPU or RAM

jeff_strater — Fri, 07 Apr 2023 01:22:03 GMT

you have a multi-CPU processor, and the nesting algorithms are inherently single-threaded, so they can only use 1 processor at a time. That is why total CPU utilization is only at 25%. If you bring up Task Manager, and look at the whole computer, you will see that one processor is VERY busy, and the rest are doing nothing, There is nothing you can really do about this on your end, unfortunately.

Re: Fusion not Fully Utilizing CPU or RAM

bigradben — Fri, 07 Apr 2023 13:33:13 GMT

Thanks for the response, here's a screenshot of a nest calculating on a less powerful computer. It looks fairly even to me. If only one core is running the nest then why isn't it maxed out?

Here's another screenshot just after if finished calculating.

Re: Fusion not Fully Utilizing CPU or RAM

bigradben — Wed, 12 Apr 2023 21:06:11 GMT

No more information?

I'd really like to get this resolved, as it's significantly impacting productivity. Or is this really as good as it's going to get? It sounds like another user is having a similar issue with nests taking a long time to generate.

Re: Fusion not Fully Utilizing CPU or RAM

FrodoLoggins — Thu, 13 Apr 2023 12:35:13 GMT

Are Autodesk's flex token powered servers for running simulations [now that running local simulations was conveniently removed] fully utilized or is that still single threaded?

Re: Fusion not Fully Utilizing CPU or RAM

welbot — Sun, 04 Aug 2024 05:27:45 GMT

I too am experiencing this issue with silly things like moving bodies. I KNOW I push fusion hard with some of the stuff I do, but I'm currently at the 5 minute mark, waiting for fusion to bring up the control to allow me to move the 30 odd bodies I have selected. My task manager shows fusion only using a max of 11% cpu, and it will eventually respond, but this gets super tiring when you come across it time and time again with sometimes the simplest things.
I absolutely expect Fusion to take significant time to do some of the things I want it to do, but moving bodies is not one of them.

Re: Fusion not Fully Utilizing CPU or RAM

grad2 — Sat, 04 Jan 2025 11:52:27 GMT

I find this to be true when I am simply trying to add or remove parts of extrusions. What would be great is if we could pause the operation while we spend some time clicking on things, and THEN go when commanded.

Re: Fusion not Fully Utilizing CPU or RAM

alex7XFRJ — Thu, 27 Mar 2025 03:56:48 GMT

im having similar issues with repairing mesh scans. i know this is a big process.... but i feel my computer should be very capable of computing this quickly. but im no expert on computer horse power. i just built the best i could at the time. im at about an hour in computing now....and ill share my screen shots of my machine performance. just seems like my computer definitely has the capacity to work harder but fusion seems to be limiting it....

Re: Fusion not Fully Utilizing CPU or RAM

g-andresen — Thu, 27 Mar 2025 06:56:49 GMT

Hi,

@alex7XFRJ schrieb:

im having similar issues with repairing mesh scans. i know this is a big process....

Mesh Mixer is the better tool for this.

günther

Re: Fusion not Fully Utilizing CPU or RAM

jeff_strater — Thu, 27 Mar 2025 16:02:01 GMT

@alex7XFRJ - did you read the response from 04-06-2023? These days, increases in "computer power" are achieved by adding more processors. As I pointed out in that response, a lot of geometry algorithms are single-threaded, which means that only one processor can be used at a time. You can see that quite clearly in your CPU graph. So, yes, your computer has power to "work harder", but only on tasks that can use other processors.

Re: Fusion not Fully Utilizing CPU or RAM

WRAITHmetalworks — Wed, 07 Jan 2026 05:39:37 GMT

Are there any plans on the roadmap to use more than one core?

Re: Fusion not Fully Utilizing CPU or RAM

grad2 — Fri, 09 Jan 2026 18:19:46 GMT

Seriously! OR - what if they made 'multiple instances' (which do actually
work just fine) a kind of built in 'method' for creating multiple threads?
I think this actually already works like this, but every time you're
passing a warning that it isn't really meant for that.