Unreal Engine 5.5 Editor UI Lags

Development Programming & Scripting
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Unreal Engine 5.5 Editor UI Lags Badly (Viewport Fine, Game Runs Fine) – Need Help!

Hi all,

I’m running Unreal Engine 5.5 on a new laptop and I’ve hit a frustrating issue:

:green_circle: Viewport is smooth
:green_circle: Map editor works fine
:green_circle: Playing in editor (PIE) runs without any lag

:red_circle: But the Unreal Editor UI is extremely laggy, especially:

  • When clicking on dropdowns
  • Scrolling through editor/project settings
  • Hovering asset thumbnails
  • Changing skeletal mesh (sometimes crashes or freezes the whole system)

:brain: System Specs:

  • Laptop: HP Victus 15-fb3009AX
  • CPU: AMD Ryzen 5 7535HS
  • GPU: NVIDIA RTX 3050 (6GB)
  • RAM: 16 GB
  • OS: Windows 11
  • UE Version: 5.5

:video_game: Drivers & Settings:

  • I’ve tried both NVIDIA Studio and Game Ready Drivers — no difference
  • Set UE .exe files to High Performance in Windows Graphics Settings
  • Set NVIDIA as preferred GPU globally via NVIDIA Control Panel
  • Disabled real-time thumbnails
  • Even after setting the system to High Performance mode, UI still lags
  • One time the GPU crashed while changing mesh from the dropdown