10-25m launch time, first time after each boot

Every first time I launch the editor I get an insanely long load time, like 10-25 minutes.

After that, each next launch is super fast 30-90s.

The parts that take a lot of time are:

  • initial splash screen - after the launch it takes about 1-2m till the UE appears on the task bar and shows a splashscreen. It’s present in Task Manager all that time though,
  • steps with “loading X modules for X plugin “ - this is where most of the time is spent.

Specs: UE 5.7.0, win11, 64gb ram, intel ultra 7 265, rtx 5070, c++ project. Task manager usages are: disc 2%, CPU 6%, memory 22%.

This happens on first launch of UE after starting the PC.

Happens also when I launch it first time after 6 hours since the PC booted (so seems not to be a ‘cold boot’ issue).

Happens when no files were changed since last launch.

Happens every time I reboot.

It happens only to one user, it’s a freshly setup PC, fresh system installation.

Things that we tried, that did not help:

  • Excluding .exe files in the antivirus
  • Deleting Binaries / Intermediate / Saved
  • Re-downloading whole repo
  • Turning on very long file names in regedit
  • Changing repo drive
  • CrystalDiskInfo reports all drives at 100%, no visible errors or red flags

What else can we try?

What drive is your DDC on?

Should use a Non-OS drive with plenty of space for DDC.