[MultiColumnComboBox] Decrease in performance

[zstoyanova9]

Description

In comparison with v17.1.0, the performance of the MultiColumnComboBox with a large number of items has decreased when both virtualization is enabled and when it is not. The time it takes for the popup of the MultiColumnComboBox to be displayed has visibly increased starting from v17.1.1. The behavior is more evident when virtualization is not enabled.

Steps To Reproduce

1. Open the following StackBlitz examples:
   • With virtualization - https://stackblitz.com/edit/angular-jgrua3zn
   • Without virtualization - https://stackblitz.com/edit/angular-jgrua3zn-pijuibgn
2. Open the popup of the MultiColumnComboBox.
3. Observe the delay in its appearance.

In comparison, here are the two corresponding StackBlitz examples with v17.1.0 where the popup opens faster and the difference in performance can be observed:

• With virtualization - https://stackblitz.com/edit/angular-ard3gnei
• Without virtualization - https://stackblitz.com/edit/angular-ard3gnei-ddnd5rfd

Screenshots or video

v17.1.1:

chrome_BZpYcDvY4N.mp4

v17.1.0:

chrome_EvrQ0G6fJt.mp4

Actual Behavior

The time it takes for the popup of the MultiColumnComboBox to be displayed has increased.

Expected Behavior

The time it takes for the popup of the MultiColumnComboBox to be displayed should not increase.