IONIC - VirtualScroll Performance issue

So, I have an array of items between 0 - 2500.

I'm trying to use the virtualscroll option (as this is what I have read to handle large arrays) to improve the diabolical performance issue when displaying\scrolling through about 1300 items.

So I've done the following, but still its painful and can crash the app when scrolling.

 <ion-list [virtualScroll]="results" approxItemWidth="100%" approxItemHeight="45px" bufferRatio=60>
    <button ion-item   *virtualItem="let result" (click)="goToClient(result)">
      {{result.FirstName}} {{result.LastName}}
    </button>
  </ion-list> 

Anyone advise what i'm doing wrong\ how to improve?