Low performance Ionic v4

My ionic-selectable component is with very low performance in comparison to ionic version 3 with de same code.

It’s taking a long time to load the list (about 200 items).

Tests:

performace comparado.png1094×952 57.4 KB

Info

Ionic:

   ionic (Ionic CLI)             : 4.12.0 (C:\Users\S59\AppData\Roaming\npm\node_modules\ionic)
   Ionic Framework               : @ionic/angular 4.6.2
   @angular-devkit/build-angular : 0.13.8
   @angular-devkit/schematics    : 7.2.4
   @angular/cli                  : 7.3.8
   @ionic/angular-toolkit        : 1.5.1

Cordova:

   cordova (Cordova CLI) : 9.0.0 (cordova-lib@9.0.1)
   Cordova Platforms     : android 8.0.0
   Cordova Plugins       : cordova-plugin-ionic-keyboard 2.1.3, cordova-plugin-ionic-webview 3.1.2, (and 24 other plugins)

System:

   Android SDK Tools : 26.1.1 (C:\Android\sdk)
   NodeJS            : v10.16.0 (C:\Program Files\nodejs\node.exe)
   npm               : 6.9.0
   OS                : Windows 10