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server push swift performance quick links changelog landing server push knowledgebase optimization server push http 2 server push allows an http 2 compliant server to send resources to a http 2 compliant client before the client requests them it is for the most part a performance technique that can be helpful in loading resources preemptively read more on wikipedia if you enable this feature swift performance will generate special rules for htaccess and also will send server push headers if the request is served via php if you enable this feature swift performance will generate separate scripts styles the pushed files will get a desktop prefix for desktop version and mobile prefix for mobile version if separate mobile device cache is enabled for example filename will be desktop critical css for critical css desktop full css for full css and desktop scripts js for merged javascript file on desktop you can add a version prefix if you define swift_performance_push_prefix constant in wp config php example define swift_performance_push_prefix 2 filenames will be 2 desktop critical css 2 mobile critical css and so on it can be useful if you make changes in css js to bypass browser cache you can fully control filenames with swift_performance_critical_css_filename swift_performance_css_filename and swift_performance_js_filename filters did you like this article search optimization javascript optimization critical css lazyload scripts disable jquery migrate server side scripts 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