Improve page speed when selecting elements on Page Editor

• Type: Task
• Status: Closed
• Priority: Minor
• Resolution: Completed
• Affects Version/s: None
• Fix Version/s: 7.3.X, Master
• Component/s: Pages > Page Editor
• Labels:
  • fc_20_09
• Branch Version/s:
  7.3.x
• Backported to Branch:
  Committed
• Epic/Theme:
  • Technical_Debt
• Git Pull Request: https://github.com/liferay-echo/liferay-portal/pull/2316

When selecting elements on a content page, there is a huge delay after users clicks until element topper is shown.

To see this issue, you need to add at least 20 fragments, so the delay is larger.