topic Re: Deactivating selection highlight on object (Speeding up cad performance) in AutoCAD Forum

Deactivating selection highlight on object (Speeding up cad performance)

cyberflow — Fri, 29 Aug 2025 16:02:27 GMT

Hi all

Was wondering, what is the variables usefull to deactivate the highlight when selecting a large set of data so it cuts the lag ?

selectionpreview to 0 ?

Lately i had to select a large set of 3DFaces and it lagged for hours before beeing able to do something (Let the computer work overnight)

Thought that deactivating this would help me a lot

I know highlighting in hatch patterns can be deactivated

Re: Deactivating selection highlight on object (Speeding up cad performance)

imadHabash — Fri, 29 Aug 2025 16:16:57 GMT

Hi,

I suggest to try with:

SELECTIONEFFECT (System Variable).
PRESELECTIONEFFECT (System Variable).
Use commands like QSELECT or FILTER instead of dragging a huge selection window.

Re: Deactivating selection highlight on object (Speeding up cad performance)

Kent1Cooper — Fri, 29 Aug 2025 17:00:51 GMT

See the appropriately named HIGHLIGHT System Variable.

Re: Deactivating selection highlight on object (Speeding up cad performance)

cyberflow — Fri, 29 Aug 2025 17:21:01 GMT

Thank you both of you @Kent1Cooper & @imadHabash !

The Highlight variable was what i was looking for !

Re: Deactivating selection highlight on object (Speeding up cad performance)

ВeekeeCZ — Fri, 29 Aug 2025 19:09:29 GMT

Not sure about 3dfaces but it's GRIPS sysvar that makes tremendous difference in speed when selecting long 3d/lwpolylines with lots of vertices.

Re: Deactivating selection highlight on object (Speeding up cad performance)

cyberflow — Fri, 29 Aug 2025 18:52:42 GMT

That's interesting ! Thanx for the cue !

Re: Deactivating selection highlight on object (Speeding up cad performance)

pendean — Fri, 29 Aug 2025 19:20:54 GMT

@cyberflow There are a few more tips here too

https://www.autodesk.com/support/technical/article/caas/sfdcarticles/sfdcarticles/Optimize-Performance-within-Windows-7-Environments.html

https://youtu.be/-DX51lYqVZI

and

https://forums.autodesk.com/t5/civil-3d-forum/settings-to-make-civil3d-faster/td-p/10333895