Improve Page Editor performance

• Type: Task
• Status: Closed
• Priority: Critical
• Resolution: Completed
• Affects Version/s: Master
• Fix Version/s: 7.3.0 CE GA1, 7.3.10 DXP GA1, Master
• Component/s: Pages > Page Editor
• Labels:
  • fc_19_11
  • fc_19_12
• Epic Link: Page Performance optimization
• Sprint: S01E02 - Giants Enigma, S01E03 - Floating Bottle, S01E04 - Turtles Swamp
• Git Pull Request: https://github.com/brianchandotcom/liferay-portal/pull/81517

When a content page has (more or less) over 100 fragments (this is an approximation, depends on the browser, pc, etc) it's performance decreases a lot.