topic Re: AutoCAD 2026 Performance Drops When Working With Large Xref Files in AutoCAD Forum

AutoCAD 2026 Performance Drops When Working With Large Xref Files

mubashiriqbal1162 — Fri, 03 Jul 2026 15:33:39 GMT

Hi everyone,

After updating to AutoCAD 2026, I've noticed significant performance issues when working on projects that contain multiple large Xref files. Opening drawings takes much longer than before, and simple operations such as zooming, panning, and switching layouts occasionally freeze the application for several seconds.

I have already tried the following steps:

Updated graphics drivers to the latest version
Disabled hardware acceleration and tested both settings
Purged and audited the drawings
Moved project files to a local SSD instead of a network drive
Reset AutoCAD settings to default

My system specifications:

Windows 11 Pro
32 GB RAM
NVIDIA RTX 3070
AutoCAD 2026

Has anyone else experienced similar slowdowns with large Xref-based projects? Are there any recommended settings, workflows, or patches that improved performance for you?

Re: AutoCAD 2026 Performance Drops When Working With Large Xref Files

vladimir_michl — Fri, 03 Jul 2026 17:16:32 GMT

Are those Xref files hosted on your network? Or on a slower disk drive? Try to adjust the variables XLOADCTL and also INDEXCTL.

Vladimir Michl, www.cadforum.cz - www.linkedin.com/in/vmichl/

Re: AutoCAD 2026 Performance Drops When Working With Large Xref Files

paullimapa — Fri, 03 Jul 2026 18:42:26 GMT

1) Do you have latest 2026 updates installed?

Enter About command, do a screenshot & share this here

2) Have you tried DirectX11 vs DirectX12?

To switch from 12 to 11:

At command prompt enter:

GFXDX12

That's a zero, close & restart AutoCAD

Enter GraphicsConfig command, do a screenshot & share this here

Re: AutoCAD 2026 Performance Drops When Working With Large Xref Files

pendean — Mon, 06 Jul 2026 17:20:37 GMT

@mubashiriqbal1162 What does "large xrefs" mean to the rest of us? and how many is "multiple"? We can't replicate what you are facing without more details.

And did you restart your PC/Laptop yet then turn off Wifi/Bluetooth/unplug from the network as a test to confirm it's still a problem since your files are now local to you for testing?

Re: AutoCAD 2026 Performance Drops When Working With Large Xref Files

rosie_lucas1 — Wed, 08 Jul 2026 19:19:30 GMT

Hello @mubashiriqbal1162,

Thank you for posting your question in the community. I noticed that you have had a few community members asking more questions about the issue you have ran into so they can assist you. Have you had the chance to look at them yet?

Best,

Re: AutoCAD 2026 Performance Drops When Working With Large Xref Files

JStanke_2_0 — Wed, 22 Jul 2026 15:48:23 GMT

Sorry to buttinski on the thread...

Different person, same problem. Files attached. I am a remote worker, so all files are local. Guessing it takes 30 seconds to regen. I can't purge layers, as they are created by a CAM product, used further down the line for fabrication. Yes, there are a ton of splines and ellipses. This is still in preliminary stage, and I have weeks / months more work to do on this, so if anyone can provide any insight to make these files move quicker, I am all ears. Help?!?!? Thanks in advance for any direction. - John

Chips and Salsa:

ACAD 2027 X60.0.0

Win 11 Pro

i9-13900K, 3000Mhz, 24 cores, 32 logical processors. (overclocked / liquid cooled)

64 GB Ram

Samsung SSD 990 Pro 1TB

Nvidia RTX A2000 12GB

File history:

Rvt from Architect, into Inventor 2027 Pro, for "view creations". Generically papered in Inventor (idw, only geometry and view names, no dimensions or tags). Exported from Inventor idw to dwg. Dwg's cleaned up, as far as layers / blocks, Overkill, purge, etc. Xrefs created, work in progress / development files. Plan views are from architects provided dwg files. Minimally cleaned. They will be eliminated as work develops. Yes, there are x-refs in x-refs.

Re: AutoCAD 2026 Performance Drops When Working With Large Xref Files

paullimapa — Wed, 22 Jul 2026 16:02:08 GMT

“I am a remote worker, so all files are local”

Perhaps you can clarify:

1) How do you remote into your office to work on these drawings?

2) Is AutoCAD running from the computer you are using to connect to your office or is AutoCAD running at the remote location?

Re: AutoCAD 2026 Performance Drops When Working With Large Xref Files

JStanke_2_0 — Wed, 22 Jul 2026 16:17:01 GMT

Paul,

I should have reworded that statement. I am a remote employee, working for a shop a couple of states over. I keep all files on my local system. I do not "remote in" while working. I do my work, then upload to server, thru vpn as needed. All files are on my computer. AutoCAD is running on my system, not browser based. Thanks... I have not tried directx12 (just read your input above). I will give that a shot after lunch...

Re: AutoCAD 2026 Performance Drops When Working With Large Xref Files

BhaskarMurari — Fri, 24 Jul 2026 14:28:59 GMT

AutoCAD Performance: How to Improve Speed When Using Xrefs
check this system variables:

XLOADCTL to 0 or 1
LAYOUTREGENCTL to 0
UPDATETHUMBNAIL to 0
SELECTIONPREVIEW to 0
SELECTIONCYCLING to 0
ISAVEPERCENT to 0
BLOCKMRULIST to 0

Re: AutoCAD 2026 Performance Drops When Working With Large Xref Files

JStanke_2_0 — Fri, 24 Jul 2026 15:03:21 GMT

THANK YOU!!!

Re: AutoCAD 2026 Performance Drops When Working With Large Xref Files

paullimapa — Mon, 27 Jul 2026 14:25:28 GMT

Follow up question:

in previous AutoCAD version before updating to 2026 were all these settings already there but didn’t get migrated over?

Re: AutoCAD 2026 Performance Drops When Working With Large Xref Files

JStanke_2_0 — Mon, 27 Jul 2026 14:40:46 GMT

Negative for most of these variables. I am using 2027 but I did migrate my 2026 settings over.

My previous settings were:

XLOADCTL = 2

LAYOUTREGENCTL = 0

UPDATETHUMBNAIL = 15

SELECTIONPREVIEW = 2

SELECTIONCYCLING = 2

ISAVEPERCENT = 50

BLOCKMRULIST = 50

I know I have changed Preview (because it drives me nuts, in most uses) and for Cycling, I toggle on/off pending complexity of what is going on (if overkill didnt clean it up imports). Xload, Thumbnail, ISAVE, and rulist were "new" to me. Never heard of them or used them in 30+ years of using AutoCAD, well from what I can remember.

Re: AutoCAD 2026 Performance Drops When Working With Large Xref Files

paullimapa — Mon, 27 Jul 2026 14:49:15 GMT

Out of curiosity if you had left all the other settings the same but just changed XLOADCTL to 0 or 1, would that resolve your problem in 2027?