topic Re: Short mouse lag (3–5s) when opening AutoCAD files – CPU/GPU/RAM all normal in AutoCAD Forum

Short mouse lag (3–5s) when opening AutoCAD files – CPU/GPU/RAM all normal

emile_madi — Wed, 28 Jan 2026 22:09:28 GMT

I’m having a weird lag issue in AutoCAD and I can’t figure out the cause.

What happens:

When I open AutoCAD or open a drawing, my mouse lags/stutters for about 3–5 seconds

After those few seconds, everything becomes perfectly smooth

The lag does not happen continuously, only right after opening files or sometimes when AutoCAD initializes

System:

CPU: Intel i7 / i5 12th–13th gen (tested both, same behavior)

GPU: NVIDIA RTX 4050 (laptop)

iGPU: Intel UHD / Iris

RAM: 16 GB

Storage: NVMe SSD

OS: Windows 11

Laptop (Gigabyte)

What I checked:

CPU usage during lag: below 30%

RAM usage: normal

Disk usage: normal

Temps: normal

Power mode: High performance

Happens even on small/simple drawings

After the initial lag, AutoCAD runs completely fine

GPU confusion:

In Task Manager, AutoCAD sometimes shows:

No GPU engine

Or “GPU 1 – Copy” instead of NVIDIA

I tried forcing AutoCAD to use the NVIDIA GPU (Windows graphics settings + NVIDIA Control Panel)

Issue still happens

Other notes:

UI lag is worse when AutoCAD panels are fully expanded

If I minimize panels (tabs/buttons), mouse lag is reduced or gone

This makes me think it’s UI / graphics initialization related, not raw performance

Re: Short mouse lag (3–5s) when opening AutoCAD files – CPU/GPU/RAM all normal

manieshkumar.suresh — Thu, 29 Jan 2026 14:36:55 GMT

Downgrade to DirectX 11 from DirectX 12 (See How to use a previous DirectX version in AutoCAD Products)

using this system variable GFXDX12 as 0 and restart the AutoCAD for the smoother performance with DirectX 11.

You can try this system variable

System variables

Set CACHEMAXFILES to 0, restart the product and set it up to 256 again.
Set UCSDETECT to 0 to turn off the UCS detection.
Set SELECTIONPREVIEW to 0.
Set STATUSBARAUTOWRAP to 0.
Set DYNMODE to 0.
Set QTEXTMODE to 1, then use REGEN to regenerate the view.
Set BLOCKMRUMODE to 0.

Re: Short mouse lag (3–5s) when opening AutoCAD files – CPU/GPU/RAM all normal

BhaskarMurari — Thu, 29 Jan 2026 16:39:15 GMT

@emile_madi Ensure your NVIDIA RTX 4050 driver is updated to the latest version. If the issue persists, try rolling back to an older driver version, as newer drivers sometimes cause cursor lag.

Also check:

Right-click the desktop and choose "NVIDIA Control Panel".
Switch to the node "3D Settings - Manage 3D Settings" and turn off Global Settings property "Vertical Sync".