I’m trying to troubleshoot an issue that is driving me pretty mad.
First of all, here is my spec:
CPU i9 9900K
Nvidia Asus ROG Strix 3090
64GB RAM
Plenty of disk space
Here is my issue :
When I try to move objects around in my viewport (lights, meshes, cameras …) UE becomes so laggy that it is impossible to place objects correctly and I have to wait 10 seconds for a new frame to pop in. But the weird thing is, it doesn’t happen for all objects in my scene. For instance the first 2 cameras I created in the level doesn’t cause any problem at all. Same for some other meshes or blueprints. However if add a new actor (even a simple cube mesh) or duplicate an existing one, then the hardcore lag appears.
My scene is not so complex (except for the lighting maybe but hiding the lights doesn’t change anything at all) and rendering at around 40fps in cinematic scalability.
I really don’t understand what’s going on but it’s not possible to keep on working on this project in this state…
Does anyone have a clue ?
There has been a string of things like this, my first thought is:
Open up your Windows Settings (System-> Display-> Graphics Settings) or Nvidia Control Panel (under Manage 3D Settings → Program Settings) and ENSURE that your 3090 is preferred for use with Unreal Engine 5. There was a Windows Update a few months ago that makes it flip flop between your chipset and dedicated graphics card, so it needs to be told to stick with the big one.
Thank you for your reply !
Unfortunately this solution doesn’t seem to work, the issue is still there.
What’s interesting is that Blueprints seem to be spared from this problem. For instance, if I create a cube mesh in the editor to place in the viewport, UE is lagging a lot. However if I create a Static Mesh Blueprint that I drag into the viewport, everything is smooth as it should be. It is so weird…
EDIT: Well actually the BP solution worked at first but the same issue appeared a few minutes later with Blueprint Plane I placed in my scene
