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smart javascript delivery swift performance quick links changelog landing smart javascript delivery knowledgebase optimization smart javascript delivery since swift performance introduced in 2017 many other caching plugins implemented it usually you can achieve the best results with delaying scripts however sometimes it needs some additional critical css to show everything fine in the above the fold content if you delay all scripts on some pages especially if there are animations or javascript rendered elements without manually added extra critical css the cls can be increased dramatically in the field data also it can affect the real user experience with smart js delivery you can optimize the javascript execution without any custom coding you can simply enable async execute and choose smart delivery if smart delivery is enabled swift performance won t wait for the first user interaction to run javascript but will load the scripts in the right order with automated timing check on youtube did you like this article search optimization javascript optimization critical css server push lazyload scripts disable jquery migrate server side scripts categories getting started general optimization caching media cdn compatibility tweaks license filters faq changelog 2026 swift performance all rights reserved made with fevr