Do you use Facebook for Woocommerce plugin on your WordPress site? If so, you may want to rethink it. I had just recently installed it onto a brand new WordPress site to access Messenger live chat and to add my products to Facebook. Only to find that my new site now had 10 critical errors and took forever to load (particularly on mobile). As soon as I removed the plugin, the errors were gone and the site loaded smoothly.
My suggestions for alternatives would be to use Tawkto for live chat (free) and add your products to FB manually with a link back to your website.