Resizing the viewport stutters

My Specs:

Mainboard: ASUS Maximus XI Formula

CPU: Intel i9 9900K

GPU: EVGA GeForce RTX 2080 Ti FTW3 Hydro Copper iCX2

RAM: G.Skill Trident Z RGB 32GB @ 3200 MHz

Nothing is overclocked.

Drivers & BIOS are up-to-date.

So my problem is, if I resize the Viewport UE4 begins to stutter (Drops to 8 FPS). Navigating around in the Viewport works fine.

Resizing any other UI Element that doesn’t affect the Viewport works fine.

I recorded a video of it: 2021 03 23 10 36 13 - YouTube

If I use 4.22.3 everything is smooth (Drops only to around 30 FPS)

Dunno why 4.26.1 performs so badly there…

Hope anyone can help, makes it really unpleasent to work with.

Best Regards