Run results for: structuredClone vs Immer Produce

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/18.0.1 Safari/605.1.15

Browser: Safari 18

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: one year ago

immer.produce()

1.0M/s

structuredClone

218/s

View exact numbers

Test name	Executions per second
✓ immer.produce()	1,019,927 Ops/sec
structuredClone	218 Ops/sec

HTML Preparation code:

<script src="https://cdn.jsdelivr.net/npm/immer@3.1.3/dist/immer.umd.min.js"></script>
<script src='https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.5/lodash.min.js'></script>
<script src="https://cdn.jsdelivr.net/npm/uuid@8.3.2/dist/umd/uuidv4.min.js"></script>

Script Preparation code:

const numSiblings = 500;
const depth = 3;

state = {
    data: {
        data1: {
            data2: 'test',
            siblings: Array.from({
                length: numSiblings
            }).map(() => ({
                id: uuidv4()
            })),
            children: Array.from({
                length: depth
            }).map(() => ({
                id: uuidv4(),
                data: {
                    data1: {
                        data2: 'test',
                        siblings: Array.from({
                            length: numSiblings
                        }).map(() => ({
                            id: uuidv4()
                        })),
                        children: Array.from({
                            length: depth
                        }).map(() => ({
                            id: uuidv4(),
                            data: {
                                data1: {
                                    data2: 'test',
                                    siblings: Array.from({
                                        length: numSiblings
                                    }).map(() => ({
                                        id: uuidv4()
                                    })),
                                    children: Array.from({
                                        length: depth
                                    }).map(() => ({
                                        id: uuidv4(),
                                        data: {
                                            data1: {
                                                data2: 'test',
                                                siblings: Array.from({
                                                    length: numSiblings
                                                }).map(() => ({
                                                    id: uuidv4()
                                                })),
                                            },
                                        },
                                    })),
                                },
                            },
                        })),
                    },
                },
            })),
        },
        data3: Array.from({
            length: 1000
        }).map(() => ({})),
    },
};

Tests:

immer.produce()
const result = immer.produce(state, draft => { draft.data.data1.data2 = 'updated'; for (let i; i < 500; i++) { draft.data.data1.siblilngs[i] = { id: uuidv4() }; } })
structuredClone
const result = structuredClone(state); result.data.data1.data2 = 'updated'; for (let i; i < 500; i++) { result.data.data1.siblilngs[i] = { id: uuidv4() }; }