Hello,

1. It could be due to the third-party plugins so please disable all plugins except these ones:

WPBakery Page Builder or Elementor
Woodmart Core
WooCommerce

If the problem has gone, activate the plugins one by one, checking the issue to detect which one causes the problem.

2. I suggest you read our article about site optimization here:

https://xtemos.com/wordpress-performance-optimization-the-ultimate-guide-in-2021/

Kind Regards