Performance Issue in Object Cloning using JSON.parse(JSON.stringify()) on Safari and Firefox

[omeri6]

Elementor uses JSON.parse( JSON.stringify( object ) ) to clone objects.
Our users report significant performance issues on Safari and FireFox browsers
from version 6.4 of WordPress.
Our performance team confirmed that the loading time on Chrome is faster.

We have detected that the problem is associated with the following commit of corejs (used in wp-polyfill): ​https://github.com/zloirock/core-
js/commit/08ceeb13e78aeb366a3fcf481698ec05f77e7b2f

We managed to partially solve the issue by replacing the code with structuredClone( object ). However we couldn't replace all the occurrences of JSON.parse( JSON.stringify( object ) ) with structuredClone(), as structuredClone() doesn't accept methods.

Using alternative solutions to deep clone objects either increased loading time or had no effect.

After discussing the issue directly with corejs team, they suggested the following solution:
​https://github.com/zloirock/core-js/issues/1316

[swissspidy]

Just so understand correctly, your suggestion is to change which core-js modules are provided by the wp-polyfill script because you ran into some issues with JSON.parse( JSON.stringify( object ) ) in your custom plugin?

I think that would require a ticket on the Gutenberg repo as it seems to come from the babel-preset-default package.

[omeri6]

Opened an issue: ​https://github.com/WordPress/gutenberg/issues/57247