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Why is my GraphQL server slow with complex queries? #4404

Closed Answered by codecraze25
hadez0528 asked this question in Q&A
Why is my GraphQL server slow with complex queries? #4404
@hadez0528 hadez0528
May 20, 2025 · 2 comments
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hadez0528
May 20, 2025

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Answered by codecraze25 May 20, 2025

Slowness often comes from N+1 query problems in resolvers. This happens when a resolver makes a separate database call for each item in a list. This adds up quickly, especially in nested queries.

query {
  posts {
    title
    comments {
      text
      author {
        name
      }
    }
  }
}

If the comments and author resolvers each make their own database calls, you'll end up making dozens or hundreds of database requests for a single GraphQL query.

Tip: Use DataLoader to batch and cache database calls. It groups similar requests and fetches them together.

With DataLoader (simplified):

const userLoader = new DataLoader(async (userIds) => {
  return await getUsersByIds(userIds); // …
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JoviDeCroock
May 20, 2025
Maintainer

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