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【Swiper】Swiperをネストしている要素にaddClassすると動作が重くなる件

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swiper
よく使っているスライダーjs
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#addClassすると何故か動作が重くなる

bodyにaddClassでis-openなどを付与してハンバーガーメニューを展開させるなどの動作が重くなる...

#原因
下記のオプションが有効だったから
observeParents: true

observeParents: false

有効の場合swiperをネストしている要素に動的になにかを追加するとswiperが反応してその他の動作が重くなるみたい

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