Google Lighthouse performance reports include an itemized list of cookies, extensions, and scripts that may be slowing down your website. At times, you may notice /collect.js
(cdn.noibu.com) at the top of the list.
To catch as many JS and HTTP errors as possible, our script instruments existing code to catch hidden errors. This means that it wraps existing code to try to find errors that were previously not reported to the console. However, because the Noibu script will appear at the top-level of any code it wraps (e.g. event handler functions), Google Lighthouse will sum up the performance impact (TBT or execution time) of all of this code and report it as associated with the Noibu script. This means that Lighthouse may report Noibu as causing significant latency depending on what code it wraps, but it does not mean the script is causing additional latency or overhead.
Additionally, keep in mind that there is random variability in Lighthouse tests that may affect your performance scores.