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Slow time to first byte (TTFB) on a PrestaShop store usually means the request is waiting on Nginx, the PHP-FPM pool, the database, or application code before the first response byte is generated. Start by measuring dynamic pages, then verify the Nginx-to-PHP-FPM path and check whether PHP-FPM workers are saturated. Only after that should you tune application code or add caching.
FastCGI caching can make anonymous catalog pages respond much faster, but it must bypass sessions, carts, checkout, customer accounts, authorization, and any response containing personal state. Static-asset caching helps repeat visits but does not shorten the time PHP needs to build a dynamic page.
What TTFB means in a PrestaShop request
TTFB is the elapsed time between a client sending an HTTP request and receiving the first byte of the response. For a dynamic PrestaShop URL, that interval can include network round trips, Nginx request processing, PHP-FPM queueing, PHP execution, database queries, module hooks, remote API calls, and cache lookups. The browser then spends additional time downloading and rendering the rest of the response. A large page or slow JavaScript therefore does not automatically explain a high TTFB.
Measure the first byte separately from total download time. If TTFB is high while the response body downloads quickly, investigate the server and application path. If TTFB is low but the total time is high, look at response size, compression, images, and front-end assets instead.
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Measure representative pages before changing settings
Use a repeatable baseline. Test from a location representative of your customers, and record both warm-cache and cold-cache runs. Do not use only the home page: it may be cached or have a very different query pattern from a product page.
Build a small URL set
- An anonymous product page.
- An anonymous category or search-results page.
- A cart request with an active cart.
- The login page and an authenticated account page.
- The checkout flow, including a request that carries the session cookie.
Run each URL several times after clearing or warming the relevant cache. Keep the cookie state consistent: an anonymous request and a request with a customer session are different workloads and should not be mixed in one result.
Capture timing with curl
This command reports DNS, connection, TLS, server processing (the TTFB value), and total time:
curl -sS -o /dev/null -w 'dns=%{time_namelookup}nconnect=%{time_connect}ntls=%{time_appconnect}nttfb=%{time_starttransfer}ntotal=%{time_total}n' https://shop.example/product-urlFor a session-dependent test, pass a cookie file or header that represents a real logged-in or cart request. Record the HTTP status, response size, and any cache indicator your configuration adds. A 200 response with a fast TTFB is not a valid success if the page contains another customer’s cart or account data.
Define a store-specific target
There is no authoritative universal “good” PrestaShop TTFB threshold. Set an objective from your baseline, page mix, geography, and business requirements. A target for a nearby anonymous catalog request should not be applied unchanged to a checkout request that performs payment, tax, or shipping calculations.
Verify the Nginx-to-PHP-FPM path first
A malformed location block can add errors, route requests to the wrong PHP version, or prevent Nginx from handing the correct script to PHP-FPM. Compare your PHP location with the official PrestaShop pattern and then test the effective configuration with nginx -t. The important controls are not cosmetic: they determine which file is executed, which socket receives it, and how Nginx handles the response.
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Required elements in the PHP location
fastcgi_split_path_infoseparates a script name from optional path information.try_files $fastcgi_script_name =404prevents Nginx from forwarding a missing script.include fastcgi_paramssupplies the standard FastCGI parameters.fastcgi_param SCRIPT_FILENAMEmust resolve to the real PrestaShop PHP file.fastcgi_passmust point to the PHP-FPM Unix socket or upstream that serves the intended PHP version.fastcgi_keep_conn oncan keep the upstream connection available for reuse.- Read and send timeouts should be long enough for legitimate requests; changing them does not make PHP execute faster.
Example location block
Adapt the document root and socket to your server. Do not paste a socket path from another machine without checking which PHP-FPM service is actually listening.
location ~ .php(?:/|$) {
fastcgi_split_path_info ^(.+?.php)(/.*)$;
try_files $fastcgi_script_name =404;
include fastcgi_params;
fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name;
fastcgi_param PATH_INFO $fastcgi_path_info;
fastcgi_pass unix:/run/php/php-fpm.sock;
fastcgi_keep_conn on;
fastcgi_read_timeout 30s;
fastcgi_send_timeout 30s;
# Increase only when measurements show large headers or responses need it.
fastcgi_buffer_size 32k;
fastcgi_buffers 16 16k;
}Some distributions use a versioned socket such as /run/php/php8.2-fpm.sock, while others expose an upstream name. Check the pool’s listen setting and make the two sides match. After edits, run nginx -t, reload Nginx, and make one request while watching the error log. A configuration test only validates syntax; it does not prove that the selected pool has capacity or that PrestaShop is using the expected PHP version.
Understand buffers and timeouts
Nginx buffering stores FastCGI response data in memory or temporary files and lets Nginx receive data from FastCGI as soon as possible. Larger buffers can help with unusually large headers or responses, but they do not cure slow PHP execution. Likewise, fastcgi_read_timeout changes how long Nginx waits before declaring a timeout; it is not a performance setting. If a request consistently needs more time, find out whether a database query, module hook, or remote call is responsible.
Check PHP-FPM capacity and slow scripts
PHP-FPM is the process manager that executes PrestaShop’s PHP code. When all pool workers are busy, new requests wait in a queue and TTFB rises even if individual scripts are reasonably fast. The pool setting that most directly determines concurrent execution is pm.max_children.
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Look for worker saturation
Inspect the pool status page or your process and service metrics during the same test that produced a high TTFB. Record active workers, idle workers, the queue length, reached-child events, CPU, and memory. A pool that repeatedly has no idle workers while requests are slow is saturated. A pool with many idle workers but high TTFB points elsewhere, such as database latency or slow application code.
Set pm.max_children from observed concurrency and available memory, not from a generic formula. Each PHP worker consumes memory that varies with the PrestaShop version, enabled modules, theme, and request. Raising the value blindly can trigger swapping, exhaust RAM, or overload MySQL, making every request slower. During a benchmark, the value must reflect the concurrent users you intend to simulate; production sizing should also leave memory for the operating system, database, Nginx, and background jobs.
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Enable a PHP-FPM slow log
The slow log records scripts that exceed a configured duration and can include PHP backtraces. Enable it for the relevant pool, choose a threshold appropriate to your baseline, reproduce a slow request, and inspect the resulting trace. A trace can reveal a specific module hook, controller, template operation, or external call that ordinary Nginx access logs cannot identify.
; pool configuration example
request_slowlog_timeout = 5s
slowlog = /var/log/php-fpm/prestashop-slow.log
Use a threshold that captures abnormal requests without filling the disk during normal traffic. Rotate the file and protect it because traces can contain URLs, parameters, and implementation details. Disable or raise the threshold after diagnosis if continuous tracing creates unnecessary I/O.
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Compare the time before a worker starts executing with the script’s own runtime. A long queue with short script times calls for capacity and workload analysis. Long script times with an empty queue call for database, module, theme, or remote-service investigation. Do not solve either case by increasing Nginx timeouts.
Find application and database delays
Once the Nginx and PHP-FPM path is sound, profile what the request does. PrestaShop can spend substantial time in database queries, module hooks, cache misses, template rendering, search operations, or calls to payment, tax, shipping, analytics, and inventory services.
Check database latency
- Measure database time separately from total PHP time if your monitoring or profiler supports it.
- Inspect the database slow-query log during a controlled reproduction.
- Look for queries whose cost grows with catalog size, filters, or customer-specific rules.
- Check connection limits, lock waits, buffer availability, and disk latency before adding PHP workers.
More PHP-FPM children can increase simultaneous database work. If MySQL is already the bottleneck, a larger pool increases contention rather than reducing TTFB.
Test modules and hooks safely
Compare a slow URL with optional modules disabled in a staging copy or during a controlled maintenance window. A module that performs a remote API call or runs expensive logic on every hook can delay otherwise simple pages. Check timeouts and retry behavior for external services; a failed endpoint that waits through repeated retries often appears as a random TTFB spike.
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Separate cache misses from cold application work
Run one cold request and then several warm requests. If only the first request is slow, investigate cache generation, filesystem permissions, opcode caching, and the cache backend. If every request is slow, focus on execution, database, or upstream capacity. Keep the test’s cookies and headers identical so you do not accidentally compare anonymous and personalized paths.
Use FastCGI cache only for cache-safe responses
Nginx’s FastCGI cache stores generated responses in a shared cache zone. It can reduce PHP work for public GET and HEAD pages, particularly catalog pages that many visitors view anonymously. The cache must never serve one customer’s state to another customer.
Start with a narrow cache policy
Begin with anonymous product and category GET/HEAD requests. Bypass and do not store responses when any of these conditions apply:
- A session, cart, or customer cookie is present.
- The request carries an
Authorizationheader. - The method is not GET or HEAD, including cart mutations and checkout submissions.
- The URL belongs to login, account, checkout, order history, or another personalized controller.
- The response sets a private cookie or otherwise contains customer-specific data.
Example bypass logic
The exact cookie names depend on your PrestaShop version and custom modules. Inspect real requests and adjust the expression rather than assuming every store uses the same names.
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fastcgi_cache_path /var/cache/nginx/prestashop
levels=1:2
keys_zone=prestashop:20m
inactive=30m
use_temp_path=off;
location ~ .php(?:/|$) {
# PHP parameters and fastcgi_pass omitted here for brevity in this cache example.
fastcgi_cache prestashop;
fastcgi_cache_methods GET HEAD;
fastcgi_cache_bypass $skip_method $skip_cookie $skip_auth;
fastcgi_no_cache $skip_method $skip_cookie $skip_auth;
fastcgi_cache_valid 200 10m;
fastcgi_cache_lock on;
}Keep the complete, verified PHP location directives alongside the cache directives; the shortened example shows policy, not a drop-in server block. Add an explicit URL-based bypass for account, checkout, login, and cart routes even when cookies are absent. Test cache hits and misses with response headers or logs, then verify that adding a product, signing in, and changing an address always reaches PHP-FPM.
Handle invalidation and stale responses
Choose a validity period that matches catalog update frequency. If prices, stock, or promotions change frequently, a long lifetime can display stale information. Cache locking can prevent many simultaneous misses from generating the same page, while stale-serving options can protect availability during a brief upstream failure. Both need testing against your inventory and pricing requirements.
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Cache static assets in browsers
Set appropriate expires and Cache-Control headers for CSS, JavaScript, fonts, and images. Browser caching avoids repeated downloads on repeat visits and reduces traffic, but it does not reduce the PHP execution time for the first dynamic HTML response. Use versioned asset filenames or another reliable invalidation method before assigning long lifetimes; otherwise visitors can retain an old theme or script after a deployment.
Review access logging deliberately
Access logging consumes CPU and I/O. Reducing log volume can lower overhead on a busy server, but retention, incident response, fraud investigations, and legal requirements come first. Prefer selective formats, sampling, or rotation over deleting logs blindly. Logging changes affect observability and request overhead; they do not make PHP code execute faster.
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PrestaShop 9 requires PHP 8.1 or newer and supports up to PHP 8.4. Nginx 1.0 or later is supported. Older PHP branches are not recommended because they are unmaintained, but an upgrade can expose incompatible themes or modules.
Upgrade with a compatibility plan
- List the active theme and every installed module, including custom code.
- Check each component’s stated compatibility with the target PHP and PrestaShop versions.
- Take a tested backup of files and the database, and rehearse restoration.
- Upgrade in staging first, then exercise browsing, search, cart, login, checkout, payment, and back-office tasks.
- Clear the relevant
var/cache/directory after the update. - Restart PHP-FPM or the web server so the new runtime and opcache state are loaded.
- Re-run the same warm and cold TTFB tests and compare errors, worker usage, database time, and cache behavior.
A newer PHP runtime may improve execution, but compatibility failures can create slower retries, fatal errors, or broken checkout. Treat the version change as a controlled deployment, not as an isolated speed switch.
Nginx versus Apache: what the available figures show
There is no universal answer that Nginx is faster for every PrestaShop store. Compare both servers with the same PHP version and PHP-FPM mode, database, hardware, cache policy, concurrency, geography, and page mix. Include dynamic TTFB, throughput, memory use, configuration complexity, observability, cache correctness, and your team’s operational familiarity.
| Server setup | Reported maximum visitors per hour | Context |
|---|---|---|
| Tuned Apache2, PHP-FPM, and MySQL | 2,810 | Single 4-vCPU, 15-GB-RAM SSD server in a 2010s vendor white-paper test |
| Tuned Nginx, PHP-FPM, and MySQL | 2,390 | The same stated hardware and test context |
Those figures describe one historical workload and configuration, not a ranking of web servers. They do not establish a TTFB target, and they should not outweigh measurements from your own store. A well-configured Apache deployment can beat a poorly tuned Nginx deployment, while either can perform well when PHP-FPM, the database, and cache policy are correctly sized.
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After each adjustment, repeat the same URLs and test conditions. Record:
- TTFB and total response time for warm and cold runs.
- HTTP status, response size, and cache hit or miss state.
- PHP-FPM active, idle, and queued workers, plus reached-child events.
- CPU, memory, swap activity, and database latency.
- Cookies and authorization headers used by the request.
- Error-log entries, slow-log traces, and checkout or account behavior.
Keep a configuration change only when it improves the intended workload without breaking personalized flows. Roll back a cache rule that produces incorrect content, a pool increase that causes memory pressure, or a buffer change that merely hides a slow script.
Quick Recap
Common symptoms and corrective actions
| Symptom | Most useful check | Likely corrective direction |
|---|---|---|
| High TTFB only during traffic spikes | PHP-FPM queue, active workers, and reached-child events | Size pm.max_children from memory and observed concurrency; investigate database contention before increasing it |
| High TTFB with idle PHP-FPM workers | Database timing, module hooks, remote calls, and cache misses | Profile the slow request and fix the slow dependency or code path |
| Anonymous catalog pages are slow but cart pages are normal | Cache status and cold-versus-warm results | Investigate cache generation or apply a narrowly scoped public-page FastCGI cache |
| Checkout becomes inconsistent after enabling cache | Cookies, authorization, methods, and URL bypass rules | Bypass and do not store every personalized or state-changing request |
| Nginx returns intermittent 404 or 502 responses | SCRIPT_FILENAME, fastcgi_pass, socket permissions, and error logs |
Correct the script path or pool endpoint and verify the service is listening |
| Requests time out but CPU is low | Slow log and upstream/database wait time | Find the blocked query, module, or remote service; do not simply raise the timeout |
| Repeat visits download every asset again | Response headers for CSS, JavaScript, fonts, and images | Set suitable browser caching and use versioned filenames for invalidation |
A practical order of operations
- Measure representative anonymous and personalized URLs, separating TTFB from download time.
- Validate the Nginx PHP location, script path, socket or upstream, and effective configuration.
- Observe PHP-FPM queueing, worker limits, memory, and the slow log during reproduction.
- Profile database queries, module hooks, cache misses, and remote calls inside the application.
- Apply a narrowly scoped FastCGI cache to anonymous, cache-safe GET/HEAD pages only.
- Set browser caching for static assets and review access-log volume within operational requirements.
- Confirm supported PHP and Nginx versions, theme/module compatibility, and a tested rollback before upgrading.
- Retest after every change and keep only changes that improve TTFB without damaging cart, checkout, account, or pricing correctness.
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