Unreal Engine Issues

UE-37153

Lengthy Compile Times on Blueprints Containing an Array of Self References When Multiple Instances Exist in the Level

Lengthy Compile Times on Blueprints Containing an Array of Self References When Multiple Instances Exist in the Level

Developer Notes

This is going to depend on the machine you're running on, but when you modify a Blueprint it needs to re-instance all instances of that BP (make sure they're new instances of the updated class). So if you have a lot in the scene, this is somewhat expected.
It's akin to spawning 50+ items all at once. My suggestion would be to iterate and work in smaller test levels upfront.

Questions & Answers
Description

There are lengthy compile times with a blueprint with 50+ instances in the level that contains an array of self references. On lower-end machines, the compile times are upwards of 10 seconds.

Found in 4.13.1. Reproduced in 4.14 Main CL 3156733 and 4.12.5.

Steps to Reproduce
  1. Open the editor
  2. Create a new actor blueprint
  3. Add a new Array variable of "ActorName" references.
  4. Place 50+ instances of the actor in the scene
  5. Attempt to compile the actor blueprint

Result: Notice a lengthy compile time. On my machine it was around 3 seconds, on the user's lower end machine it was reported as 10 seconds.

Expected: An average compile time of a second at most.

Community References

Recompilation of blueprint with array property take ages

Recompilation of blueprint with array property take ages

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Won't Fix
ComponentUE - Gameplay - Blueprint
Affects Versions4.12, 4.13, 4.14
CreatedOct 11, 2016
ResolvedOct 11, 2016
UpdatedApr 27, 2018