ID 393301 - Loading and reverting a project is taking longer in 3.1 than in 3.0 due to collapsed event handlers

Problem summary:

Loading a scene is taking longer in 3.1 than in 3.0. Reverting (File->Revert) a project takes even longer.

Adding a "disable" parameter to a node, synchronizing the value of this parameter with the node's bypass state. Loading a scene containing a few of these parameters on its nodes slows down the scene loading and reverting compared to 3.0

Steps to reproduce:

- Launch Katana 3.0
- Create a bunch of nodes with a "disable" parameter set to 1
- Save the Scene
- Change the scene somehow
- Revert - time how long it takes
- Repeat the same in 3.1 - it will be slower

An example script to create the test scene:
 

def createNodes(N):    groupNode = NodegraphAPI.CreateNode('Group', NodegraphAPI.GetRootNode())    for i in range(N):      newNode = NodegraphAPI.CreateNode('AttributeSet', groupNode)      newNode.getParameters().createChildNumber('disable', 1)createNodes(5000)

Expected behaviour:

Smooth opening of the scene

Actual behaviour:

The time will grow exponentially with the number of nodes. This becomes very noticeable when a few thousands of nodes (like, 5000) are used. 

Workaround:

No known workaround.

Tested versions/platforms:

• 3.0v8 - Unaffected
• 3.1v4 - Affected

Customer version/platform:

Not supplied