Frame loss upon Alt Tabbing into Fortnite (since update)

Please select what you are reporting on:

Creative

What Type of Bug are you experiencing?

Live Edit

Summary

Since this update, after Alt Tabbing into Fortnite will cause massive frame loss for 2-3 seconds. Even though its not for long, building in Live edit when you constantly switch to UEFN and back, this becomes a problem. I attached a video with FPS counter to see.

Steps to Reproduce

Open live edit
Alt Tab between UEFN and FN

Expected Result

Similar to previous update, no frame loss upon gaining focus of the window, character moves instantly

Observed Result

Upon gaining focus of the window, the character and game lose frames (on a top-end PC) in both Fortnite and UEFN (in UEFN its longer)

Platform(s)

PC