5.3.0: Array items perform much worse

Prerequisites

• I have searched the existing issues
• I understand that providing a SSCCE example is tremendously useful to the maintainers.
• I have read the documentation
• Ideally, I'm providing a sample JSFiddle, Codesandbox.io or preferably a shared playground link demonstrating the issue.

What theme are you using?

core

Version

5.0.0-beta.18 vs. 5.0.0-beta.19

Current Behavior

We wanted to test out the latest update to rjsf (upgrading from 5.0.0 beta11 to 5.3.0) in order to benefit from the new ability to 'copy' array items, which was added as a feature in the latest release.

Unfortunately, the performance of the updated version is much worse when it comes to adding/removing array items - to an extent where it now takes ~1-2 seconds to add a new entry, up from <0.1 seconds in the previous release. After isolating the release introducing this, it seems to start after 5.0.0-beta.18.

I am unable to replicate this in the live playground, though I am unsure why.

Expected Behavior

I would expect the performance to be similar to previous versions.

Steps To Reproduce

1. Use a standard rjsf setup with 5.0.0-beta.18 vs. 5.0.0-beta.19

2. Use below custom array template:

3. To replicate this, test with the below formdata (config) and schema/uischema. The slow performance can be seen by going to CAN CH1 and adding entries in the Transmit list section. json-schema.zip