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accessWidget does not interfere at all with a site’s source code and works through the use of JavaScript code that will only change the code on the browser level of an end-user. This means no permanent changes are made to your site in any way and if you need to remove accessWidget, it will be as though you never installed it in the first place.
In addition to this, accessWidget loads asynchronously. This means that the browser does not wait for it to load in order to show your site or allow visitors to take action. Therefore accessWidget does not affect site loading times or the site optimization score even the least bit.