Speed performance
Hidden or offscreen images have a size that can result in a potential saving in terms of KiB (kibibytes): SeoChecker is able to display to you in a table like the one below the hidden or offscreen images of the analyzed web page along with the size and the potential saving.
Therefore, it is strongly recommended to delay their loading, at least until the Time to Interactive loading is completed.
Learn more about Speed performance
On page SEO performance and page checkup.
Over 300 parameters for the deeper page analysis.
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