Mastodawn

LarsThiessen Sep 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 thread

Olivier Groulx

@LarsThiessen Good stuff!

Here are two other crazy performance catastrophes related to assets :

- if you pass a list of map names when cooking, it'll take a ridiculous amount of time to resolve them to map assets. Use fully qualified names instead.

- The blueprint editor, when it opens for the first time, will scan the asset database for blueprint libraries to populate the functions list UI, and *load them*. This can be very slow if your blueprints libraries have hardref to assets...