[FLEX-20718] DragManager performance problem with SDK 3.2.0 and later.

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: Adobe Flex SDK 3.2 (Release)
• Component/s: Drag and Drop
• Environment: Affected OS(s): Windows; Affected OS(s): Windows; Browser: Internet Explorer 8.x; Language Found: English
• Assignee: Adobe JIRA
• Reporter: Adobe JIRA
• Created: 24/Aug/09 13:59
• Updated: 03/Nov/09 15:07
• Resolved: 09/Oct/09 11:52

Description

Steps to reproduce:
1. Create a project using SDK 3.2.0 or a later release.
2. Drag a component using DragManager.doDrag. Depending on your computer speed. You may need to create multiple instance of your component or a bigger project to notice the slowdown effect.
3. Alternatively, you may compile the attached project.

Actual Results:
Drag is slow and show multiple hang time. Using the profiler, you can see memory usage increase while you drag the component. Looking at the allocation trace, you will find thousands of ReferenceError instances under the [mouseEvent] method in a short amount of time.

Expected Results:
A smooth and constant drag movement as it was prior to SDK 3.2.0. No memory usage increase while dragging and no ReferenceError instance.

Workaround (if any):
Use SDK 3.1.0 or prior release.