LarsThiessenSep 27, 2025
It's understandable that Unreal needs to touch a lot of files when starting the editor. But what if I told you that more than 5500 of those files are not needed for the editor to start at all and are just adding multiple seconds to the editor launch time?
Let's fix this!
#UE5 #gamedev
https://larstofus.com/2025/09/27/speeding-up-the-unreal-editor-launch-by-not-opening-5500-files/
Speeding up the Unreal Editor launch by … not opening 5500 files?

In my last article I wrote about some tooltip optimization to reduce the start time of the Unreal Editor by 2-5 seconds. Turns out people do really care about their editor start time. So much that …

Larst Of Us
Show threadAras PranckevičiusSep 28, 2025

@LarsThiessen Excellent work! (also, I see @superluminal screenshots, I like :))

I suspect finding and fixing these types of small slowdowns can be a fulltime job at this scale. My last several years at Unity were similar, but it is an uphill battle. Yes you find a ton of small inefficiencies all the time, and they are easily fixable. The problem is, there are several hundred people sometimes adding *new* inefficiencies.

Show threadLarsThiessen
@aras @superluminal
Thanks, glad you liked it.
I wonder how many fulltime jobs you could actually fill with that amount of stuff if you also include all the plugins and tools that ship with the engine. It's probably a decent number and with all the Fortnite-money Epic could easily pay for them ;)
Sep 28, 2025 at 9:16amWeb