How to increase Fusion 360 Offset Performance

[justin.korbel]

Hello,

Recently I have been getting frustrated with Fusion for being slow and taking a long time to process computes, particularly offsets in sketches that have a lot of lines and fit point splines. I have looked all over online for help and have tried to optimize the graphics settings but nothing I do has seemed to improve performance.

Here is my current system:

Ryzen 7 2700X at 4GHz

32 gb DDR4 at 3000 MHz

GTX 1650

NVMe SSD

I run 3 monitors, and lots of other programs in the background, which I know is not helping performance but I am wondering if anyone would have suggestions for how to improve performance? I know that the GPU I am using is underpowered for my system overall compared to my other parts, but everything I have read online says that Fusion uses mostly the CPU and my GPU usage has never spiked during the times when Fusion has been unresponsive. Would any of you be able to weigh in on whether a GPU upgrade would improve performance or have any other advice? Below is an offset that took about a minute of Fusion being unresponsive to process:

Thanks!

Justin

[hamid.sh.]

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@justin.korbel wrote:

... offsets in sketches that have a lot of lines and fit point splines...

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Both offset in sketch and spline with a lot of lines are bad practice in Fusion. Offsetting the solid or surface body is often better. Also If your sketch is imported DXF or SVG I suggest simplifying it e.g. trace inside Fusion with smaller number of points. One other thing that might help is unchecking Show Profile in Sketch Palette:

[justin.korbel]

Thanks for the advice! I'll see what I can do in the future about doing the offset on a solid body instead and using fewer sketch points. I will definitely try deselecting "show profile" as well and hopefully, those combined changes will make Fusion run better.

[TrippyLighting · Accepted solution]

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@justin.korbel wrote:

... instead and using fewer sketch points....

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There is no "instead". Use fewer sketch points!

Fit point splines in Fusion 360 are 5-degree multi-span NURBS.

The more fit points you add to such a spline, the more computationally intense the spline becomes.

Creating an offset spline from an under constrained fit point spline with 100+ fit points is very computationally intensive and the number of cores, RAM or GPU your system uses is irrelevant, because this is a single core CPU computation.

The unconstrained nature of such splines then also really stresses the sketch solver, and can easily slow the design down in general, not just when you are actively working on a sketch.

[g-andresen · Accepted solution]

Hi,

The basic rule for splines (not only in Fusion) is as many control points as necessary but as few as possible.

günther

[justin.korbel]

Thanks! I will definitely be doing that in the future!