[jQuery]fadeInが重いときの対処法

少しはまったので備忘録

変更前

jQuery

$('.open-btn').on('click', function () {
	$('.modal').fadeIn().css('display', 'flex');
});
$('.close-btn').on('click', function () {
	$('.modal').fadeOut();
});

CSS

.modal {
    position: fixed;
    width: 100vw;
    height: 100svh;
    z-index: 999999;
    left: 0;
    top: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: scroll;
    display: none;
    background: black;
    transition: .3s;
}

変更後

jQueryは変えずにCSSのtransitionを削除

CSS

.modal {
    position: fixed;
    width: 100vw;
    height: 100svh;
    z-index: 999999;
    left: 0;
    top: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: scroll;
    display: none;
    background: black;
    /* transition: .3s; ここを削除  */
}