I did not have this issue in 4.11.2, but always had these short (~5-10 sec) freezes in the Editor in 4.12.5.
The same thing is happening in 4.13p3 (in all previews actually).
While my PC is quite old, I did not have this issue prior to 4.12
My hardware specs are the following:
AMD Phenom x3 2.2Ghz
8Gb RAM
Nvidia GF 670 GTX 2Gb
Windows 7 Pro 64-bit
For reference, this was originally reported on the 4.13 Preview forum thread, along with a few users who said they are experiencing various freezes: Unreal Engine 4.13 Preview - Announcements - Unreal Engine Forums
This issue may be difficult to track down, and may benefit from input from multiple users who experience similar issues. This is not a widespread issue for all users, so thank you for your patience and understanding.
+1 Same here, my specs:
i5 3570K 3.40GHz @4.40GHz
8GB RAM
NVIDIA GTX 760
Windows 10
Same here. Several second freezes during which CPU usage is spiking for UE4Editor.exe
Worth noting that i’ve started experiencing freezes not since a specific UE4 version was deployed, but rather after launcher update, that happened around 11-14 august.
Oh, you nailed it - I read your post here, closed my launcher while keeping Editor opened and bam! - all freezes are gone. Editor works as smooth as butter.
It’s not a solution to close launcher as I might need to switch a project or open another project to migrate assets into current one.
I am still working in 4.12.5 for my current project, so someone has to test it in 4.13p3
I closed the launcher and then sciulpt the Landscape in UE4 Editor and have a freeze ;;;!!
Hmm I’ve ran the engine with launcher closed for a few hours and did not get any freezes either. Not sure how conclusive it is so far.
Hey everyone,
I get the feeling that the landscape sculpting could be a different issue, so could you please open a new thread for that @VassiliosC
As far as the other freeze goes, please reply back to let me know if closing the launcher has resolved the freezes, as I have not been able to reproduce this on my end.
I can confirm that having launcher opened causes the freezes. Official 4.13 here. For now I’m just closing the launcher every time, but I hope it’ll be fixed in the future 
Good day Sean. I can confirm that having launcher closed gets rid of freezes, while keeping it open results in random editor freezes once in a while.
I also have this issue at the moment. Any word on a fix?
Hello,
Have you tried working with the Launcher closed to see if that resolves the freezes? We’ve been unable to reproduce the issue on our end at this time, so there hasn’t been a ticket entered. If you can provide a set of repro steps so that we can reproduce it on our end, that would be great as well!
With Launcher opened I get continuous frequent freezes. With Launcher closed I still get those short freezes, just less often.
Hello everyone,
Everyone who has not already posted their specs, please provide your DxDiag so I can take a look and see if there are any hardware correlations.
Thanks!
Same here, it’s still freezing even with Launcher closed, just less often. It’s quite ‘random’, so I guess that the best way to reproduce this is to work an ~hour on some project on machine with similar specs to the ones listed above. … + Maybe operating system also matters, mine is Windows 10.
It’s been happening for me after importing assets from an older Unreal engine version.
(but it could also be because I opened the launcher to add those assets. haven’t tried without. it’s very random because later it was working fine again… after restarting everything.)
Edit; I think my launcher was open for the entire time. (I remember paragon updating)
[link text][1]
[1]: 105921-dxdiag.txt (88.5 KB)
Thank you all for posting your specs. I have another question that I’d like those who are experiencing the freeze to answer:
When you are experiencing these freezes, are you noticing any increase in memory? Go to Edit->Editor Preferences->Miscellaneous and enable the Show Framerate and Memory option to keep track of this. You can also use Task Manager. Please provide the exact numbers if you are seeing an increase.
Thanks!
So, I switched from 4.12.5 to 4.13 for my Sky Light tests - freezing is horrible with launcher opened and with launcher closed. I’d say freezed x2 - x3 times more often than 4.12.5.
I turned on that option you suggested - it stopped freezing as often (launcher closed) and when I experienced freezing memory value did not change.
Just freezed for ~5s, and with no memory increase (checked in Task Manager)