Any project Lag/Frame rate very low in editor - not playmode

Unity Editor Interface
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1

This is present when I open an old project (e.g. In Unity 6 preview or Unity 2022 - 3 LTS) or start a new project in either version.

When I am in the editor, just moving the mouse around and have not yet started working and not yet entered Playmode, there is a noticeable lag or lack of normal framerate (feels about 10 fps).

Interestingly, the lag isn’t present while:

  • Playmode is active.

Or when not active:

  • When I move UI elements.
  • When I have dropdown menus such as File or Edit open.
  • When I click and drag in the scene (selection box or move objects.
  • When I click and drag (not interacting with anything) in the game window.

Screen Recording doesn’t capture the issue.

Unfortunately, the issue isn’t as noticeable via the phone.

There is also a barely perceptible flickering happening, like a screen refresh. Occasionally it is more noticeable on the edges of the screen.

This did start after a Windows update last night and may be related as I had this bug before, sometime last year.

I don’t recall if or how it was fixed as I did take some time away from dev.

This is extremely distracting. I have restarted the computer, checked the drivers, and installed the latest version of Unity 6 all to no avail. My RAM usage is high but even with all other apps closed and sitting at 40% usage, the problem persists.

I’m about to look at purging all installs that I have present on my PC and starting with a fresh install.

I don’t believe this is version related but maybe something shared?

Any help would be greatly appreciated.

2

So I tried reinstalling Unity to no effect. I then uninstalled ALL versions I had installed and reinstalled Unity 6. Again, no change.

I tried deleting some preferences-related files/folders too.

After deleting all related files to Unity from appdata and other various locations and then reinstalling Unity 6 the problem is still here^.

^ I prematurely thought I had fixed the problem but it was just a spike of normal performance.

3

I have found a fix! It seems this is related to G-sync/V-sync.

I have found this very useful post that helped a great deal!

Specifically for my solution, I changed my Monitor technology to “Fixed Refresh” for unity.exe.
This will also modify “Preferred Refresh Rate” and “Vertical Sync” automatically.

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I will leave this here in case someone has similar symptoms to mine.

4

Thanks for posting your fix. This worked for me!

Posting specs and info so this answer gets indexed more:

Problem:

  • Low refresh rate in Unity editor (Unity 6)
  • Frame drop when editing in Unity 6
  • G-SYNC causing issues with Unity editor

NVIDIA GeForce RTX 4070

5

What a great help !
many thanks, my friend