Displaying Asset Categories takes too long in Control Panel - Unresponsive Javascript warning occurs in the browser

• Type: Bug
• Status: Closed
• Resolution: Fixed
• Affects Version/s: 6.0.12 EE, 6.0.X EE, 6.1.1 CE GA2, 6.1.20 EE GA2
• Fix Version/s: 6.0.X EE, 6.1.2 CE GA3, 6.1.30 EE GA3, 6.2.0 CE M5
• Component/s: Categories, Frontend Infrastructure
• Labels:
  • 6.0_release_notes
  • QA-R
  • QA-TP
  • categories
  • ee-ts
  • javascript
• Branch Version/s:
  6.1.x, 6.0.x
• Backported to Branch:
  Committed
• Epic/Theme:
  • Escalation
• Story Points: 4
• Fix Priority: 4

1. Create more than 1500 Asset Categories in a single Vocabulary in a two level hierarchy, about 25 categories on the first level, the rest on the second one.
2. Open the Category Administration in the Control Panel in the browser.
As a result, the browser will indicate that the running script may have stopped responding.

Reproducible with Firefox and Internet Explorer