frog.wix.com is Wix attempt at analytics/performance monitoring. It is yet another piece of bloatware that slows down your website. Try testing your website performance with https://webpagetest.org (make sure you choose a test location and device which is used by most your users - I normally choose a iPhone or Android device)
To also answer user259’s comment, I checked the network for these URL network requests and they’re 152 bytes which shouldn’t impact the delivery of the page. You can see the images below:
I will mention as well that when it comes to some tools like PageSpeedsInsights throttle mobile to a very slow rate. You can see for my site on mobile, the same site as above is throttled to 1.6mbs, which is low even for 4G LTE rates as provided by bandwidthplace.