🐛 Bug Report

Immer takes a long time to update the data.

Link to repro

To Reproduce

Chrome console:

console.time('create');
const dataSource = Object.fromEntries(
  [...Array(4000).keys()].map((key) => [key, { key, data: { value: key } }]),
);
console.timeEnd('create');

console.time('update');
const result = produce(dataSource, (draft) => {
  draft[1000].data.value = 100;
});

console.timeEnd('update');

Observed behavior

I checked the source code, the problem is in shallowCopy。If you use Object.assign instead, there is no performance problem

Time-consuming code:

...
const descriptors = getOwnPropertyDescriptors(base)
...
return Object.create(Object.getPrototypeOf(base), descriptors)

Expected behavior

Time shouldn't be so long

Environment

We only accept bug reports against the latest Immer version.

• Immer version:
• I filed this report against the latest version of Immer
• Occurs with setUseProxies(true)
• Occurs with setUseProxies(false) (ES5 only)