FieldResolver performance

[sergey-shablenko]

I have made few load tests using same logic with and without fields with FieldResolver
query with FieldResolver has 2x worse performance than without them
field resolvers I used are very simple ones

Any ideas why? How to improve?

query without field resolvers

query CoinTypes($page: Float!, $pageSize: Float!, $locale: SupportedLocales!) {  coinTypes(  page: $page  pageSize: $pageSize, locale: $locale) {  data {  id  idX  defaultCoin {  id  image {  id  url  __typename  }  __typename  }  __typename  }  total  __typename  } }

query with field resolvers

query CoinTypes($page: Float!, $pageSize: Float!, $locale: SupportedLocales!) {  coinTypes(  page: $page  pageSize: $pageSize, locale: $locale) {  data {  id  idX  ruler {  id  name(locale: $locale)  __typename  }  mint {  id  name(locale: $locale)  __typename  }  metal {  id  name(locale: $locale)  __typename  }  denomination {  id  name(locale: $locale)  __typename  }  state {  id  name(locale: $locale)  __typename  }  defaultCoin {  id  image {  id  url  __typename  }  __typename  }  __typename  }  total  __typename  } }

  @FieldResolver(() => GraphQLString, { name: 'name', nullable: true })
  async name(
    @Root() someEntity: SomeEntity,
    @Arg('locale', () => SupportedLocales) locale: SupportedLocales
  ): Promise<string> {
    return someEntity[`name${capitalize(locale)}`];
  }

results with field resolvers (4 of them)

results without field resolvers

[mwanjabala]

Depending on the scale a few more fields could result in a lot more function calls in the resolvers. That coupled with Node.js / JS single threaded nature might be problematic.

[yaacovCR]

My apologies, but I am not seeing the exact lines in the numbers above where the 2x worse performance is demonstrated. That certainly does seem excessive. I am not sure if it is something that we can help with, but if you are able to set up a minimal reproduction using just vanilla graphql JS, that might help.

[yaacovCR]

Closing for now, please feel free to reopen!