Poor performance on large lists when using templates

[Bartozzz]

My data set contains ~3000 elements, each one containing 4 properties:

[
  {
    "id": "…",
    "name": "…",
    "fullName": "…",
    "imageUrl": "…"
  }
]

When I try to customize the option slot, as follows:

<VueSelect label="name" :options="options" :onChange="…">
  <template slot="option" slot-scope="option">
    {{ option.fullName}}
    <b-badge class="ml-auto" variant="primary" pill>{{ option.id }}</b-badge>
  </template>
</VueSelect>

… there's a visible delay on selecting items from the dropdown:

[Violation] 'message' handler took 278ms
[Violation] 'message' handler took 290ms
[Violation] 'message' handler took 279ms
[Violation] 'message' handler took 269ms
[Violation] 'message' handler took 267ms
[Violation] 'message' handler took 647ms