Significant Latency When Fetching Data with Apollo Client in a React App Using GraphQL Subscriptions
I've spent hours debugging this and I'm experiencing an unexpected increase in latency when using Apollo Client to subscribe to real-time updates via GraphQL subscriptions in my React app... The app fetches data from a GraphQL server and uses the `useSubscription` hook to update the UI when new messages are received. While the initial fetch of messages is fast, subsequent updates introduced a noticeable delay of around 2-3 seconds, which is unacceptable for a real-time application. I've already set up the Apollo Client with the following configuration: ```javascript import { ApolloClient, InMemoryCache, split } from '@apollo/client'; import { WebSocketLink } from '@apollo/client/link/ws'; import { HttpLink } from '@apollo/client'; const httpLink = new HttpLink({ uri: 'https://mygraphqlapi.com/graphql', }); const wsLink = new WebSocketLink({ uri: 'wss://mygraphqlapi.com/graphql', options: { reconnect: true, }, }); const splitLink = split( ({ query }) => { const definition = getMainDefinition(query); return ( definition.kind === 'OperationDefinition' && definition.operation === 'subscription' ); }, wsLink, httpLink, ); const client = new ApolloClient({ link: splitLink, cache: new InMemoryCache(), }); ``` In my component, I use the `useSubscription` hook as follows: ```javascript import { gql, useSubscription } from '@apollo/client'; const MESSAGE_SUBSCRIPTION = gql` subscription OnMessageAdded { messageAdded { id content createdAt } } `; const Messages = () => { const { data, loading, error } = useSubscription(MESSAGE_SUBSCRIPTION); if (loading) return <p>Loading...</p>; if (error) return <p>Error: {error.message}</p>; return <div>{data.messageAdded.content}</div>; }; ``` I've also checked the Network tab in the browser's DevTools, and while the initial subscription request goes through fine, subsequent updates are taking much longer than expected. I've experimented with changing the `reconnect` option to `false`, but it didn't seem to help. Is there a way to optimize the performance of these subscription updates? Are there any best practices or configurations I might have missed out on that could alleviate this latency issue? The project is a application built with Javascript. Thanks for your help in advance!