It isn't the CSS. This is the function "Equal Height | wraps". When I delete this, the Accordion works fine. But how can I get the other boxes in the same height as the accordion?
I meant, that accordion is working fine, but that 'laggy' effect is related to the modifications too. Indeed, the Equal Height does the problem, because this feature is not made for this purpose. As you can see, the accordion in this example you sent is not inside any box.
If you will make these boxes near accordions to be equal height then the smooth effect will be only on the accordion, the boxes will change their size in a second(like before).
I tried to customize it with the CSS in a lot ways now, but without any result.
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Indeed, the Equal Height does the problem, because this feature is not made for this purpose.
As you can see, the accordion in this example you sent is not inside any box.