Extremely Long Sync/Reload Times in Large Project (~3GB)

Summary

Whenever I sync my large project (approx. 3GB) from URC, the editor sometimes enters a “Reloading / Fixing-Up References” screen that can last up to 1 hour before I can continue working. This has been happening consistently for the past few weeks, and it severely impacts iteration speed.

Please select what you are reporting on:

Creative

What Type of Bug are you experiencing?

Assets

Steps to Reproduce

Open a large UEFN project (~3GB).

Sync changes from URC.

Observe the loading screen:

Message shows “Reloading /…”

“Fixing-Up References” takes extremely long (up to 1 hour).

Happens frequently, even if very few assets were changed.

Expected Result

Sync should complete in a few minutes without reloading the entire project every time.

Observed Result

Project enters a lengthy reload/fixing-up process (up to 1 hour), even on minor syncs.

Platform(s)

PC (UEFN)

Additional Notes

Issue started a few weeks ago, did not happen before on the same project.

Hardware:
CPU: High-end (running at 4.7 GHz, plenty of headroom).
Memory: 64 GB installed, 45 GB used during sync (so UEFN is eating a lot of RAM).
Disk 0 (C:): NVMe SSD, so disk speed isn’t the bottleneck.
GPU 1: NVIDIA RTX 4080 SUPER (plenty of power).

Project size ~3GB, heavy use of UI Widgets and Verse.