mutative

The readme explains how Mutative achieves better performance over Immer: https://github.com/unadlib/mutative#readme

The readme explains in more detail: https://github.com/unadlib/mutative#readme > Immer must have auto-freeze enabled by default(Performance will be worse if auto-freeze is disabled), such immutable state with Immer is not common. In scenarios such as cross-processing, remote data transfer, etc., we have to constantly freeze these immutable data. > There are more parts that could be improved, such as better type inference, non-intrusive markup, support for more types of immutability, Safer immutability, more edge cases, and so on. Also compared to native spread operation(naive handcrafted reducer): > The spread operation has performance pitfalls... > And Mutative optimization focus on shallow copy optimization, more complete lazy drafts, finalization process optimization, and more.

for those considering Immer, check out Mutative or Limu instead (both much faster) https://github.com/unadlib/mutative https://github.com/tnfe/limu

Strongly recommend trying [limu](https://github.com/tnfe/limu)，it is now the fastest immutable data js lib，and it is also production environment available. //You can verify through the following tests, and you are also welcome to add more performance test cases ```bash git checkout https://github.com/tnfe/limu.git cd benchmark npm i ## Then execute the following commands separately npm run s1 npm run s2 npm run s3 npm run s4 ``` The results of one set of performance tests  At the same time, the number of single test cases has increased to 500+, with a coverage rate of '95+' (the results can be viewed by executing NPM run tests in the root directory)