Thank you all for the response. A small part of my work field usually looks like the one shown below, and the number of objects can reach up to 20,000. But the question arose because everything works smoothly when exporting to CorelCAD. I have an RTX 3060 video card and an I5 11400 processor, should I upgrade the processor anyway?

Hi Brian, can you please send me (e-mail moi@moi3d.com) the .3dm file with your curves in it?

I can try running it with profiling on to see if there are any bottlenecks that might be tuned up.

Also have you tried the v5 beta with it? https://moi3d.com/beta.htm .

Thanks, - Michael

I am working in version 5, the file that significantly slows down I sent to your email

Hi Brian,

Did you try turning off all object snaps to see if navigating the viewport speeds up? The reason I ask is because I've noticed that things can get pretty sluggish if there are a lot of curves and I use something to control the viewports other than the pan/zoom/rotate buttons. Like using a SpaceMouse creates this problem. I think it's because the pan/zoom/rotate buttons temporarily disable calculation of object snaps by the CPU, but navigating with a SpaceMouse doesn't.

So, if you're not using the pan/zoom/rotate buttons you might try using them instead, or try manually turning off object snaps to see if it's the object snap calculation part that's slowing things down.

- Peer

Another thing which you might want to turn off in moi.ini for heavier files is:

[Drawing Aids]
<....>
ObjectSnapShowMarkers=n

That will disable the little "x" marks that show the available snaps around the mouse cursor. If you are working zoomed out on a heavy file there can be quite a lot of these getting drawn and it also needs to compute their visibility if View > "Display hidden lines" is off.

- Michael