React Hook Form: How to prevent unwanted re-renders on nested form fields?
I'm converting an old project and I tried several approaches but none seem to work. I'm working on a personal project and I'm using React Hook Form v7 to manage a dynamic form with nested fields, and I'm working with performance optimization due to unnecessary re-renders. My form has an array of items, and each item contains fields that can be added or removed by the user. The question arises when I update a specific field; it seems to trigger re-renders for all fields in the form, which is affecting performance. Here’s a simplified version of my code: ```javascript import { useForm, useFieldArray } from 'react-hook-form'; const MyForm = () => { const { control, handleSubmit } = useForm({ defaultValues: { items: [{ name: '', age: '' }], }, }); const { fields, append, remove } = useFieldArray({ control, name: 'items', }); const onSubmit = (data) => { console.log(data); }; return ( <form onSubmit={handleSubmit(onSubmit)}> {fields.map((item, index) => ( <div key={item.id}> <input {...register(`items.${index}.name`)} placeholder="Name" /> <input {...register(`items.${index}.age`)} type="number" placeholder="Age" /> <button type="button" onClick={() => remove(index)}>Remove</button> </div> ))} <button type="button" onClick={() => append({ name: '', age: '' })}>Add Item</button> <button type="submit">Submit</button> </form> ); }; ``` I’ve tried to wrap the input fields in `React.memo`, but it hasn’t helped much. The `useFieldArray` seems to be the cause of the re-renders since updating any field in the array causes the entire list to re-render. Is there a way to optimize this behavior, or a best practice that I might be missing to reduce unnecessary rendering? This is part of a larger CLI tool I'm building. Has anyone else encountered this? I'd really appreciate any guidance on this. My development environment is Linux. Any advice would be much appreciated. Any help would be greatly appreciated!