Apollo Client performance

BadApp.js

import React from 'react';
import { ApolloProvider, useSubscription } from '@apollo/react-hooks';
import { RootNavigator } from './navigation';
import { client } from './apollo';
import { mySubscription } from './graphql';

function App() {
  useSubscription(mySubscription, {
    // directly pass instance of apollo client because subscription used
    // before ApolloProvider, and client cannot be taken from context
    client, 
    onSubscriptionData: ({ client, subscriptionData }) => { ... }
  });
  return (
    <ApolloProvider client={client}>
      <RootNavigator />
    </ApolloProvider>
  );
}