set site_speed_sample_rate

Hi,

This parameter is not included in the plugin yet (link).

Instead, we offer a couple of filters so you can customize and add this parameter on your own:

* https://github.com/woocommerce/woocommerce-google-analytics-integration/blob/a7d5cb3c4b471bdb6bd94bf6b72b300073f68b60/includes/class-wc-google-analytics-js.php#L260-L265

For assistance with customization or development with your site, we recommend reaching out to someone on our [Customizations Page](https://woocommerce.com/customizations/).