a-menu performs very slow with large dataset

[Neevalt]

• I have searched the issues of this repository and believe that this is not a duplicate.

Version

4.2.6

Environment

Linux mint 22, Firefox 141, Vue 3.2

Reproduction link

Steps to reproduce

Open the two buttons

What is expected?

Both dropdowns perform the same

What is actually happening?

The a-list dropdown is fast to open, the a-menu one is not

[github-actions]

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