GraphQl Custom Attributes Options output need optimization

[zakdma]

Class \Magento\EavGraphQl\Model\Output\Value\Options\GetCustomSelectedOptionAttributes is not optimized for attributes with huge amounts of options (> 10000).
Request like this take too much time to retrieve such custom attributes selected values

query {
    products(
      filter: { category_id: { eq: "2"}}
    ) {
        total_count
        items {
            name
            sku
            custom_attributesV2(filters: {used_in_product_listing: true}) {
              items {
                code
                label
                ... on AttributeValue {
                      value
                    }
                ... on AttributeSelectedOptions {
                      selected_options {
                        label
                        value
                      }
                    }
              }
            }
        }
    }
 }

I suggest to optimize it.
The acceleration was from 3 to 4 times for my project.

[m2-assistant]

Hi @zakdma. Thank you for your report.
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[zakdma]

@magento I am working on this

[m2-assistant]

Hi @zakdma! 👋
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[zakdma]

@magento add to contributors team

[m2-assistant]

Hi @zakdma! 👋
Thank you for joining. Please accept team invitation 👉 here 👈 and add your comment one more time.

[zakdma]

@magento I am working on this

[m2-assistant]

Hi @engcom-Bravo. Thank you for working on this issue.
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