Hello,

When I use Layout: card without any animation its causing performance issue on IOS10-IE11. When I remove layout: card then its working fine but have to manually do show/hide component. I have found Ext JS 6.2.0 working fine on IOS10-IE11 without any issues. While checking the CSS found missing css causing issue. Below is the solution around it. Plz fix in next version.

ext\modern\theme-base\sass\src\layout\Card.scss
Code:
.#{$prefix}layout-card {
    position:relative;
    overflow:hidden
}

.#{$prefix}component.#{$prefix}layout-card-item {
    // A card item should always fill the width and height of its container regardless
    // of whether the user configured a height and/or width on the item.
    position: absolute;
    top: 0;
    right: 0;
    bottom: 0;
    left: 0;
}
Thanks,
Dhaval