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One free scan finds every outdated or missing driver and matches the right update for your exact hardware.Free scan · exact hardware matchNginx can improve the part of a PageSpeed result that happens between your application and the browser: compressing text, reusing safe responses, and serving static files efficiently. It cannot, by itself, repair oversized images, render-blocking JavaScript, third-party scripts, or slow application code. The reliable method is to run PageSpeed Insights or Lighthouse, identify failing audits Nginx can influence, change one area, and measure again.
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This guide shows which directives to use, where they belong, how to avoid caching private content, and how to tell whether a change improved real user experience rather than only a lab score.
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What PageSpeed is measuring—and where Nginx fits
PageSpeed Insights combines two kinds of evidence: Lighthouse lab audits and field data from real Chrome users when enough data exists for the page and origin. Lighthouse gives a URL a series of audits and produces a report of opportunities and diagnostics. Its score bands are 0–49 Poor, 50–89 Needs Improvement, and 90–100 Good. The score guidance page accessed on 15 October 2026 also warns that a perfect 100 is extremely challenging and is not an expected universal target.
Nginx sits at the delivery layer. A configuration change can reduce bytes on the wire, prevent repeated trips to an origin server, or shorten the path used to read a static file. Those changes can improve transfer time, largest contentful paint, and other audits when delivery is the bottleneck. They do not alter the bytes generated by an image editor, remove JavaScript that blocks rendering, or make a slow database query faster.
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| Nginx approach | What it changes | Main cost or risk | Use it when |
|---|---|---|---|
| Gzip response compression | Reduces the size of compressible text sent to the browser | Runtime CPU consumption; poor MIME selection can waste work | HTML, CSS, JavaScript, JSON, XML, SVG, and other text responses are large enough to benefit |
| Proxy caching | Reuses an origin response instead of generating it for every request | Disk usage, invalidation complexity, and the risk of serving stale or private data | The response is safe to share and has a clear freshness policy |
sendfile and tcp_nopush |
Improves the kernel path used to transfer static files and packetize headers | Benefits depend on the operating system, storage, and traffic pattern | Nginx serves files directly rather than only proxying an application |
try_files |
Checks local files and directories before routing a miss to a backend | Incorrect fallbacks can create loops or hide application routes | A site mixes static assets with a dynamic front controller |
| ngx_pagespeed | Generates and serves optimized resources through a module | Compatibility, build provenance, cache behavior, and operational maintenance | You have validated the module and its generated-resource cache in your exact production stack |
Measure before changing Nginx
Changing directives without a baseline makes it impossible to know whether a result came from Nginx, a different test run, or a changing backend. Treat PageSpeed as a measurement loop rather than a configuration checklist.
1. Capture a repeatable baseline
- Open PageSpeed Insights and test the exact public URL that matters. Test the mobile and desktop views separately; they can expose different bottlenecks.
- Record the performance score, the failing audits, and the opportunities and diagnostics listed in the report. Note whether a value comes from Lighthouse lab data or real-user field data.
- Repeat the run enough to see whether results are broadly consistent. Do not treat one unusually fast or slow run as proof of a configuration effect.
- Inspect the response headers and the Nginx access log for the tested resource. You need to know whether the response came from the origin, a cache, or a precompressed file.
- Change one material delivery behavior at a time, then run the same URL and viewport again. Keep a dated record of the directive, deployment, and before-and-after audit.
For a quick header check, request the URL without downloading the body:
curl -I https://example.com/After editing configuration, validate syntax before reloading:
nginx -tOnly reload after a successful test, and watch the error log and response headers immediately afterward. A lower lab score after a change is a signal to investigate, not a reason to keep the change simply because it looks technically modern.
2. Select only audits Nginx can influence
- Compression and transfer-size opportunities are candidates for gzip or precompressed files.
- Repeated origin work and high time-to-first-byte for public responses are candidates for proxy caching.
- Slow static-file delivery or inefficient file lookups are candidates for
sendfile,tcp_nopush, andtry_files. - Image-format, image-size, and responsive-image findings require changes to the image assets or application markup, not just the reverse proxy.
- Render-blocking code, unused JavaScript, third-party scripts, and slow server-side computation require application or dependency work.
Compress text responses safely
Compressing responses often significantly reduces transmitted data. The documented Nginx pattern is to enable gzip, list the MIME types that should be compressed, set a minimum response size, and decide whether proxied responses should be compressed. Runtime compression uses CPU, so it should be aimed at text rather than applied indiscriminately to already-compressed media.
Use a narrow, explicit gzip policy
gzip on;
gzip_types text/plain text/css application/javascript application/json application/xml image/svg+xml;
gzip_min_length 1000;
gzip_proxied no-cache no-store private expired auth;These directives can be placed in the http, server, or location context as permitted by Nginx. A common arrangement is to keep the general policy in http and override it only for an exceptional location. The MIME list should match the content your server actually emits; adding a type that is already compressed does not create a useful saving.
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Understand each directive
gzip on;enables on-the-fly compression for responses that meet the other conditions.gzip_typeslimits compression to named content types. HTML is handled by Nginx’s default behavior; the list above covers common CSS, script, data, XML, and SVG responses.gzip_min_length 1000;avoids spending CPU on very small responses where headers and compression overhead can outweigh the saving. The value is measured in bytes.gzip_proxiedcontrols compression of responses received from a proxied server. The shown flags target responses marked no-cache, no-store, private, expired, or requiring authorization; confirm that this matches your cache and privacy policy.
Prefer precompressed files when you can build them
If your deployment process can create .gz assets, Nginx can serve those files with:
gzip_static on;gzip_static makes Nginx look for a matching precompressed file; it does not perform runtime compression. This shifts CPU work to the build step, but every generated asset must be published and invalidated together with its uncompressed counterpart. Verify that your content negotiation and cache keys distinguish compressed and uncompressed variants correctly.
Check that compression is actually happening
Request a known text asset with an Accept-Encoding: gzip header and inspect the response:
curl -H 'Accept-Encoding: gzip' -I https://example.com/assets/app.cssLook for a gzip content-encoding header and compare the content length with an uncompressed request. Test HTML, CSS, JavaScript, JSON, and SVG separately; one location block or upstream header can override another. If CPU rises sharply, raise the minimum length, narrow the MIME list, or move more compression to the build pipeline.
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Cache public responses without leaking personalized data
Proxy caching can remove repeated origin work. When caching is enabled, the documented Nginx Plus behavior is to cache GET and HEAD responses by default and serve later requests from a disk cache. The performance benefit is real only when the cached response is safe for more than one requester and its freshness rules are correct.
A starting configuration
http {
proxy_cache_path /data/nginx/cache keys_zone=mycache:10m max_size=1g inactive=60m;
server {
location / {
proxy_cache mycache;
proxy_cache_valid 200 302 10m;
proxy_cache_valid 404 1m;
proxy_cache_bypass $cookie_nocache $arg_nocache;
proxy_no_cache $http_pragma $http_authorization;
proxy_pass http://backend;
}
}
}The cache path belongs in the http context. The cache name is then selected in the relevant server or location. In this example, successful and redirected responses remain valid for 10 minutes, while a not-found response is retained for one minute. The bypass variables allow a request carrying a no-cache cookie or query argument to skip reading an existing entry. The no-cache rule prevents storing responses when the request carries a pragma or authorization header.
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Decide what must never be shared
Do not copy the example unchanged for authenticated pages, account dashboards, carts, user-specific recommendations, or any response that varies by cookie, authorization, or user identity. A shared cache can return one person’s response to another person if the cache key and bypass policy do not account for personalization.
- Start with genuinely public pages and versioned static or API responses whose contents are identical for all visitors.
- Document how an editor, deployment, or data update invalidates the cache. A ten-minute validity window is not a substitute for an invalidation plan when changes must appear immediately.
- Decide how query strings, cookies, authorization, and content negotiation affect the cache key. The example’s bypass and no-cache controls are safety boundaries, not universal rules.
- Observe cache hits, misses, stale entries, disk usage, and origin load after deployment. A cache that fills the disk or serves stale pages is a production problem even if Lighthouse improves.
Test cache behavior as a state machine
- Request a public URL once and record the origin response and headers.
- Request it again and verify that the second request is served from the cache according to your logging or diagnostic header.
- Change the origin content, then confirm whether the old response remains for the documented validity period.
- Send the no-cache cookie or query argument and verify that the request bypasses the existing entry.
- Repeat the test with an authenticated request and confirm that private content is not stored or shared.
These checks matter more than a promised score increase. Caching can improve time to first byte for repeat requests while doing nothing for a first visit whose slowest resource is an image or a render-blocking script.
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Enable direct file transfer
The F5 Nginx documentation describes sendfile as eliminating the step of copying file data into an intermediate buffer and enabling direct copying from one file descriptor to another. A typical static-file policy is:
sendfile on;
tcp_nopush on;tcp_nopush works with sendfile to send response headers in one packet. The combination is most relevant when Nginx serves files directly. Measure on the operating system and storage used by your server; it is not a replacement for reducing the size of the files themselves.
Resolve files before invoking the application
location / {
try_files $uri $uri/ @backend;
}try_files checks whether the requested path maps to a file or directory. If neither exists, it routes the request to the named @backend location. This avoids sending every image, stylesheet, script, or favicon through the application while preserving a fallback for dynamic routes.
Define the named backend location to match your upstream design, and test both a real file and a missing route. A malformed fallback can create an internal redirect loop, return a false 404, or bypass application routing. Keep directory handling intentional: a trailing slash redirect, an index file, and a front-controller route are different behaviors.
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Images and application code still dominate many audits
Google’s image guidance notes that images often account for much of a page’s downloaded bytes. It recommends choosing format, quality, resolution, and responsive delivery for each asset and device. Nginx can deliver an optimized image quickly, but it cannot decide the correct crop or recover bytes already present in an oversized source file.
- Export each image at the largest rendered size actually needed, rather than shipping a camera-resolution original.
- Choose an image format and quality level appropriate to the asset; a photographic hero and a flat icon do not have the same compression needs.
- Provide responsive variants so a small phone does not download the desktop hero image.
- Set dimensions in markup or CSS to reduce layout shifts while the resource loads.
- Audit the largest contentful element separately from background images and below-the-fold media.
Likewise, Nginx cannot remove render-blocking application code, eliminate an expensive third-party tag, or repair a slow backend query. If the Lighthouse report points to those causes, route the work to the build, frontend, database, or dependency owner instead of adding more server directives.
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The ngx_pagespeed project documents an optional module configuration using pagespeed on;, a writable pagespeed FileCachePath, and location handlers for optimized resources. It also shows verifying the module with an X-Page-Speed response header.
This is a generated-resource system, not a simple switch equivalent to gzip or sendfile. Before production use, verify all of the following in the exact Nginx build and deployment model:
- Module compatibility with your Nginx version, operating system, TLS stack, and other compiled modules.
- Build provenance and how security updates are delivered for the module.
- Write permissions, disk sizing, eviction, and backup behavior for
FileCachePath. - How optimized resources are invalidated when source files, HTML, or application routes change.
- Whether the module alters cache headers, content negotiation, or debugging in ways your CDN and browser cache understand.
- A before-and-after audit on representative pages, including pages with personalization and pages that set strict security headers.
Use the response header only as a verification signal that the module handled a response. It is not evidence that the generated output improved a Core Web Vital. Keep the module only if measured gains outweigh the additional operational surface.
A rollout plan that limits regressions
- Baseline. Save PageSpeed Insights results for the target URLs, viewport types, failing audits, and field-versus-lab status.
- Fix the largest delivery defect first. If text transfer is large, test gzip or precompressed files. If repeat origin work is high and content is public, test proxy caching. If static resolution is wasteful, test
sendfile,tcp_nopush, andtry_files. - Validate syntax and deploy narrowly. Run
nginx -t, reload, and begin with one server, location, or small traffic slice. - Check correctness before speed. Confirm status codes, content types, cookies, authorization behavior, cache headers, and compressed responses.
- Re-run the same audits. Compare the same URL and device class, then watch real-user field data as it accumulates. A lab improvement does not guarantee an immediate field improvement.
- Keep or revert based on evidence. Revert a change that increases errors, CPU, stale content, disk pressure, or private-data exposure, even if a single score moved upward.
Troubleshooting common Nginx/PageSpeed failures
The score did not change after enabling gzip
Check whether the audited resource is already compressed, smaller than gzip_min_length, served by a different location, or returned with a MIME type absent from gzip_types. Also check whether the audit’s largest transfer is an image or font rather than text. Compression cannot reduce bytes that are not compressible text.
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CPU usage increased after compression
Runtime gzip trades CPU for fewer transmitted bytes. Narrow the MIME list, increase the minimum size, or generate .gz files during the build and enable gzip_static. Recheck both server CPU and transfer time; saving a few bytes on tiny responses is rarely worth substantial CPU.
Cached pages show old or another user’s content
Disable caching for the affected location immediately, purge the entries, and inspect cookies, authorization headers, query strings, and cache keys. Reintroduce caching only for responses proven public, with explicit bypass and no-cache rules and a documented invalidation process.
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Test the filesystem path, Nginx root, and the order of try_files arguments. Confirm that the named backend location exists and does not route back to the same try_files block indefinitely. Test a real file, a directory, and a route that only the application can generate.
The module header is missing
If you enabled ngx_pagespeed, verify that the running Nginx binary actually contains the module, that the directive is in the active configuration, and that the response passed through the location where the module is enabled. A missing X-Page-Speed header can mean the request bypassed the module rather than that optimization failed.
The practical order of operations
Start with measurement, then apply the smallest safe delivery change that addresses a failing audit. Use gzip for suitable text, proxy caching only for responses that are safe to share, and sendfile, tcp_nopush, and try_files to streamline static delivery. Treat ngx_pagespeed as a separate module decision with compatibility and cache obligations. Finally, fix image weight and application behavior at their source: Nginx can make good bytes travel faster, but it cannot make the wrong bytes disappear.
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