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Questa regola viene attivata quando PageSpeed Insights rileva che le risorse possono essere pubblicate senza compressione gzip.
Panoramica
Tutti i browser moderni supportano e negoziano automaticamente la compressione gzip per tutte le richieste HTTP. L'abilitazione della compressione gzip può ridurre le dimensioni della risposta trasferita fino al 90%, il che può ridurre notevolmente il tempo necessario per scaricare la risorsa, ridurre l'utilizzo dei dati da parte del client e migliorare il tempo per il primo rendering delle pagine.
Per scoprire di più, consulta la
compressione del testo con GZIP.
Suggerimenti
Abilita e testa il supporto della compressione gzip sul tuo server web. Il progetto Boilerplate HTML5 contiene file di configurazione di esempio per tutti i server più diffusi, con commenti dettagliati per ogni flag e impostazione di configurazione: trova il tuo server preferito nell'elenco, cerca la sezione gzip e verifica che il server sia configurato con le impostazioni consigliate.
In alternativa, consulta la documentazione del tuo server web su come abilitare la compressione:
PageSpeed Insights segnala che molti dei miei file di contenuti statici devono essere compressi con gzip, ma ho configurato il mio server web in modo che pubblichi questi file utilizzando la compressione gzip.
Per quale motivo PageSpeed Insights non riconosce la compressione?
I server proxy e il software antivirus possono disattivare la compressione quando i file vengono scaricati su un computer client. I risultati di PageSpeed Insights sono basati su intestazioni effettivamente restituite al client; pertanto, se esegui l'analisi su un computer client che utilizza tale software antivirus o che si trova dietro un server proxy intermedio (molti proxy sono trasparenti e potresti anche non essere a conoscenza di un proxy che interviene tra il client e il server web), potrebbero essere la causa di questo problema.
[null,null,["Ultimo aggiornamento 2025-07-25 UTC."],[[["\u003cp\u003eThis documentation applies to a deprecated version of PageSpeed Insights (v4) and will be shut down soon; users should refer to the latest version (v5).\u003c/p\u003e\n"],["\u003cp\u003eThe primary focus of this document is to explain how enabling GZIP compression can significantly improve website performance by reducing file sizes.\u003c/p\u003e\n"],["\u003cp\u003ePageSpeed Insights may report compression issues due to interference from proxy servers or anti-virus software affecting the headers returned to the client.\u003c/p\u003e\n"],["\u003cp\u003eModern browsers inherently support GZIP compression, so enabling it on your web server is crucial for optimization.\u003c/p\u003e\n"],["\u003cp\u003eThis page offers guidance and links to resources on how to enable GZIP compression for various web servers like Apache, Nginx, and IIS.\u003c/p\u003e\n"]]],["PageSpeed Insights flags resources served without `gzip` compression, which can reduce response size by up to 90%. Modern browsers support `gzip`, improving download time and data usage. To resolve this, enable and test `gzip` on your server, using tools like `mod_deflate` for Apache, `ngx_http_gzip_module` for Nginx, or configure HTTP compression in IIS. Proxy servers or anti-virus software can interfere with compression, impacting PageSpeed Insights' results.\n"],null,["# Enable Compression\n\n| **Deprecated** . This page was written for version 4 of the PageSpeed Insights API, which is deprecated and will be shut down in May 2019. [Version 5](/speed/docs/insights/v5/get-started) is the latest and provides both real-world data from the Chrome User Experience Report and lab data from Lighthouse.\nThis rule triggers when PageSpeed Insights detects that compressible resources were served without `gzip` compression.\n\n### Overview\n\nAll modern browsers support and automatically negotiate `gzip` compression for all HTTP requests. Enabling `gzip` compression can reduce the size of the transferred response by up to 90%, which can significantly reduce the amount of time to download the resource, reduce data usage for the client, and improve the time to first render of your pages. See [text compression with GZIP](/web/fundamentals/performance/optimizing-content-efficiency/optimize-encoding-and-transfer#text-compression-with-gzip) to learn more.\n\n### Recommendations\n\nEnable and test gzip compression support on your web server. The HTML5 Boilerplate project contains [sample configuration files](https://github.com/h5bp/server-configs) for all the most popular servers with detailed comments for each configuration flag and setting: find your favorite server in the list, look for the `gzip` section, and confirm that your server is configured with recommended settings. Alternatively, consult the documentation for your web server on how to enable compression:\n\n- Apache: Use [mod_deflate](http://httpd.apache.org/docs/current/mod/mod_deflate.html)\n- Nginx: Use [ngx_http_gzip_module](http://nginx.org/en/docs/http/ngx_http_gzip_module.html)\n- IIS: [Configure HTTP Compression](http://technet.microsoft.com/en-us/library/cc771003(v=WS.10).aspx)\n\nFAQ\n---\n\nPageSpeed Insights reports that many of my static content files need to be gzipped,\nbut I have configured my web server to serve these files using gzip compression.\nWhy is PageSpeed Insights not recognizing the compression?\n:\n Proxy servers and anti-virus software can disable compression when files are downloaded to a\n client machine. PageSpeed Insights' results are based on headers that were actually returned\n to your client, so if you are running the analysis on a client machine that is using such\n anti-virus software, or that sits behind an intermediate proxy server (many proxies are\n transparent, and you may not even be aware of a proxy intervening between your client and\n web server), they may be the cause of this issue.\n\n\nFeedback\n--------\n\nWas this page helpful? \nYes Great! Thank you for the feedback. If you have a specific, answerable question about using PageSpeed Insights, ask the question in English on [Stack\n| Overflow](https://stackoverflow.com/questions/tagged/pagespeed-insights). For general questions, feedback, and discussion, start a thread in the [mailing list](https://groups.google.com/forum/#!forum/pagespeed-insights-discuss).\nNo Sorry to hear that. If you have a specific, answerable question about using PageSpeed Insights, ask the question in English on [Stack\n| Overflow](https://stackoverflow.com/questions/tagged/pagespeed-insights). For general questions, feedback, and discussion, start a thread in the [mailing list](https://groups.google.com/forum/#!forum/pagespeed-insights-discuss)."]]
