Improve performance when switching between Designer and Modeler

Steps to reproduce

• From any feature in Modeler, Ctrl+K to open Quick Switcher and search for any feature in Designer.
• Hit Enter.
  => Quick Switcher closes.
  => ~2-3 seconds elapse before Modeler disappears and Designer loading page appears.
  => ~2-3 seconds elapse before Designer page is loaded.
• Ctrl+K, switch to a different feature in Designer.
  => ~1 second elapses before page is loaded.
• Ctrl+K, switch to a feature in Modeler.
  => ~1-2 seconds elapse before Designer disappears and Modeler appears.