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Trim preview keeps freezing my drawings.
I know there is a known issue with 'complex' drawings which can cause trim preview to make the computer lag. However my drawings aren't complicated at all, very simple building floor plans xref'd into my drawing and then i place blocks and simple polylines (straight lines or boxes, nothing with huge amounts of vertices') and not only will it lag, it will completely freeze and lock up with no hope of recovery without killing the process...this is getting very old very quickly...very sick of having to redo 10's of minutes of work at least once a day, simply because the trim command kills the application.
the latest freeze was caused by trimming a straight line with 3 vertices (2 end, one middle) across a spline with 10 vertices spaced out by several meters, the straight line was very much between 2 vertices, so its not an ambiguity thing.
the fix shouldn't be turn off functions this multi-thousand-dollar-a-year application comes built with, if it doesn't work, it should have never been added to the application to begin with.
any replies claiming this is as the solution will not be accepted, so don't bother.
my computer is brand new, 11th gen i7, a 12gb enterprise level graphics card with 32gb of ram on a single stick so its definitely not a fault with the computer.
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We all understand your frustration.
Post your software ABOUT information for others to provide additional help.
In the meantime, consider all the suggestions from these links:
- AutoCAD crashes or freezes when using most commands
- Crash or freeze while editing a drawing in AutoCAD
- Delay, freeze, or crash, when inserting a block or drawing in AutoCAD Products
- System requirements for AutoCAD
- CERTIFIED GRAPHICS HARDWARE - AutoCAD (Note: Cards and drivers not listed may still work with the pr...
Please select the "Accept as Solution" button if my post solves your issue or answers your question.
Emilio Valentin
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Hello @MaccyDee
Try typing in the command "COMMANDPREVIEW" and set it to "0". Is it any better now?
ವಿನೋದ್ ಕೆ ಎಲ್( System Design Engineer)

Likes is much appreciated if the information I have shared is helpful to you and/or others.
Please mark "Accept as Solution" if my reply resolves the issue or answers your question, to help others in the community.
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in most of the cases when autocad freeze on trim when 2 line have different elevation , or 2 type of line, in your case spline and line, try instead trim to use comands>break, breakatpoint
hope it will help
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The feature has been working for thousands of people for many years. When you're done blaming the program you'll need to figure out what's going on your end to cause this.
Rob
Drafting is a breeze and Revit doesn't always work the way you think it should.
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Greetings @MaccyDee
Set GFXDX12 variable to 0 (that's a zero) then restart AutoCAD/LT: see if that helps.
Also consider turning off LINESMOOTHING and LINEFADING variables all the time.
If still no relief then start GRAPHICSCONFIG command and change the 2D Display Settings pulldown from "advanced mode" to one of the other choices.
If still no relief, set COMMANDPREVIEW command to 0 (that's a zero).
If all else fails, then turn off Hardware Acceleration as a last resort, and start a support ticket with Autodesk through your subscription portal as explained here https://knowledge.autodesk.com/customer-service/account-management/users-software/support-options#:~....