Tooltips causing performance issues when used in a table

[Neill83]

Bug description or feature request:

Tooltip is lagging in a table when there a plenty of rows.

Plunker/StackBlitz that reproduces the issue:

Here is a table with 500 entries: Stackblitz

Here is another example with 2000 entries: Stackblitz

Versions of ngx-bootstrap, Angular, and Bootstrap:

ngx-bootstrap: 5.1.0,
angular: 7.2.15,
bootstrap: 4.3.1

Build system: Angular CLI, System.js, webpack, starter seed:

angular-cli, webpack
Browser: Chrome latest version