WooCommerce Composite Products plugin: wp_options table grows unlimitedly

I have an old WC ste, without the possibility to update it.
* WordPress 4.2.24
* WooCommerce 2.3.13
* WooCommerce Composite Products 3.6.10
It works well except for a performance and resources issue with WooCommerce Composite Product.

The wp_options table grows unlimitedly on each edition of the composite products (for existing composite products and also for new ones).
Nowadays takes for about 4 minutos to save any chances to an existing composite products.

Any idea?
Is there any way to clean the wp_options table?
Don’t know, but seems any time new registers are created.

Thanks a lot
Fabio