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server side scripts swift performance quick links changelog landing server side scripts knowledgebase optimization server side scripts with swift performance you can add arbitrary javascript which won t be executed in the browser but during the caching process so you can use javascript for dom manipulations before the page has been loaded for the user it can be really useful when you need to resize an element based on the screen size remove or add classes hide or show elements etc if you enable separate mobile device cache server side scripts will be executed separately on desktop sized and mobile sized screen as well so you can resize elements for both screens debugging if you enable logging in general settings and set the loglevel to error then if there is any javascript error on the server side you can see the errors in the swift performance debug log and the browser console if you check the cached page did you like this article search optimization javascript optimization critical css server push lazyload scripts disable jquery migrate preprocess scripts categories getting started general optimization caching media cdn compatibility tweaks license filters faq changelog 2026 swift performance all rights reserved made with fevr
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