Large frame drop on an empty island with just landscape

Reference ID

I had a project with just landscape and once I launched live edit and alt tabbed on UEFN, the frames dropped from the usual 120 to 19 for around 20 seconds. There was no loading, the map is empty, and I simply changed a setting on island settings when it happened. The PC is not the issue either, I have loaded way more complex projects and the current engine scalability was set to medium, so there is no reason this frame drop happened. Logs attached.

Please select what you are reporting on:

Unreal Editor for Fortnite

What Type of Bug are you experiencing?

World Building

Summary

I had a project with just landscape and once I launched live edit and alt tabbed on UEFN, the frames dropped from the usual 120 to 19 for around 20 seconds. There was no loading, the map is empty, and I simply changed a setting on island settings when it happened. The PC is not the issue either, I have loaded way more complex projects and the current engine scalability was set to medium, so there is no reason this frame drop happened. Logs attached.

Steps to Reproduce

Load a new island, build a landscape, launch live edit for the first time, then alt tab and at times you ll get a sudden frame drop.

Expected Result

Editor not to lag

Observed Result

Editor drops frames for a short amount of time (see logs)

Platform(s)

PC