https://www.siarv.it/block/sfondo-chi-siamo/
Tested 2026-10-15 20:14:32 using Chrome 154.0.8037.57 (runtime settings)
The red band on the timeline marks when the main thread was busy with long tasks: moments when the page could not paint or respond, however the video looks.
Download videoUse --filmstrip.showAll to show all filmstrips.
Click a frame to seek the video to that moment. The dot marks frames where the page changed visually.
Rendering was not meaningfully delayed. First paint landed at 416 ms on a 62 ms first byte; the 9 render-blocking requests were done by 154 ms and the remaining ~262 ms is style and layout work.
Want to see how much CSS style-recalculation work delayed FCP and LCP, plus CPU long tasks? Run with --cpu.
Blocking requests delay both paints: the browser renders nothing until they arrive, so they push First Contentful Paint and everything after it, including the largest paint (LCP). Requests that block the parser inside the body stall everything after them in the document. Load JavaScript with defer or async, and keep non-critical CSS off the critical path with media attributes. Bars show when each request loaded on a clock that runs to the last paint; the gap after the bars is style and layout work.
| Request | When it loaded | Transfer | Download |
|---|---|---|---|
document | 54 ms | 16.5 KB | 53 ms |
ca29e.jsblocking | 75 ms | 158.3 KB | 75 ms |
d10d2.jsblocking | 75 ms | 82.4 KB | 75 ms |
9a399.jsblocking | 61 ms | 31.0 KB | 61 ms |
4476d.jsblocking | 59 ms | 37.7 KB | 59 ms |
3bcfd.cssblocking | 58 ms | 163.6 KB | 58 ms |
9512b.jsblocking | 54 ms | 10.7 KB | 54 ms |
3dabc.cssblocking | 30 ms | 476 B | 30 ms |
b1a86.cssblocking | 26 ms | 7.6 KB | 26 ms |
| 6 more requests | all done by 288 ms | 181.6 KB | |
LCP resource | 54 ms | 126.8 KB | 54 ms |
0104 ms208 msFCP · LCP 416 ms |
The coach helps you find performance problems on your web page using web performance best practice rules. And gives you advice on privacy and best practices. Tested using Coach-core version 9.2.1.
googleTagManagerThe page is using Google Tag Manager, this is a performance risk since non-tech users can add JavaScript to your page.
Google Tag Manager makes it possible for non tech users to add scripts to your page that will downgrade performance.
modernImageFormatsThe page ships 4 images (out of 4) in JPEG/PNG/GIF without a modern alternative. Wrap them in a <picture> with a <source type="image/avif"> or "image/webp" before the legacy <img>, or serve modern formats from your image pipeline directly. AVIF and WebP usually deliver 25–50% smaller files at the same quality.
AVIF and WebP routinely deliver 25–50% smaller files than JPEG and PNG at the same perceived quality, and every browser version still under support understands at least one of them. Ship modern formats either through a <picture> element with <source type="image/avif"> / "image/webp" entries in front of the legacy <img>, or directly from a content-negotiating image pipeline that returns AVIF / WebP when the client accepts it. https://web.dev/articles/serve-images-webp
cssSizeThe total CSS transfer size is 240 kB and uncompressed size is 1.6 MB. That is big and the CSS could most probably be smaller.
Delivering a massive amount of CSS to the browser is not the best thing you can do, because it means more work for the browser when parsing the CSS against the HTML and that makes the rendering slower. Try to send only the CSS that is used on that page. And make sure to remove CSS rules when they aren't used anymore.
| URL | Transfer | Content |
|---|---|---|
| https://www.siarv.it/siar/wp-content/cache/minify/52458.css | 63.9 KB | 377.3 KB |
| https://www.siarv.it/siar/wp-content/cache/minify/b1a86.css | 7.2 KB | 31.9 KB |
| https://www.siarv.it/siar/wp-content/cache/minify/3bcfd.css | 163.2 KB | 1.2 MB |
| https://www.siarv.it/siar/wp-content/cache/minify/3dabc.css | 90 B | 75 B |
javascriptSizeThe total JavaScript transfer size is 636.5 kB and the uncompressed size is 2.2 MB. This is totally crazy! There is really room for improvement here.
A lot of JavaScript often means you are downloading more than you need. How complex is the page and what can the user do on the page? Do you use multiple JavaScript frameworks?
| URL | Transfer | Content |
|---|---|---|
| https://www.siarv.it/siar/wp-content/cache/minify/4476d.js | 37.3 KB | 115.5 KB |
| https://www.siarv.it/siar/wp-content/cache/minify/9512b.js | 10.3 KB | 27.4 KB |
| https://www.siarv.it/siar/wp-content/cache/minify/ca29e.js | 157.9 KB | 549.1 KB |
| https://www.siarv.it/siar/wp-content/cache/minify/9a399.js | 30.6 KB | 100.8 KB |
| https://www.siarv.it/siar/wp-content/cache/minify/d10d2.js | 82.0 KB | 371.1 KB |
| https://www.siarv.it/siar/wp-content/cache/minify/d9704.js | 4.0 KB | 10.6 KB |
| https://www.siarv.it/siar/wp-content/cache/minify/4d350.js | 3.4 KB | 12.2 KB |
| https://www.siarv.it/siar/wp-content/cache/minify/39133.js | 73.9 KB | 270.2 KB |
| https://www.siarv.it/siar/wp-content/cache/minify/5071c.js | 32.7 KB | 157.9 KB |
| https://www.siarv.it/siar/wp-content/cache/minify/c75a6.js | 1.3 KB | 2.9 KB |
| https://www.google-analytics.com/analytics.js | 20.9 KB | 51.1 KB |
| https://www.googletagmanager.com/gtag/js?id=G-VY6V55TE93&cx=c&_slc=1 | 162.2 KB | 466.7 KB |
| https://cdn.siarv.it/siar/wp-includes/js/wp-emoji-release.min.js?ver=7.1.3 | 5.0 KB | 18.8 KB |
longTasksThe page has 3 CPU long tasks with the total of 230 ms. The total blocking time is 48 ms and 2 long tasks before first contentful paint with total time of 132 ms. However the CPU Long Task is depending on the computer/phones actual CPU speed, so you should measure this on the same type of the device that your user is using. Use Geckoprofiler for Firefox or Chromes tracelog to debug your long tasks.
Long CPU tasks locks the thread. To the user this is commonly visible as a "locked up" page where the browser is unable to respond to user input; this is a major source of bad user experience on the web today. However the CPU Long Task is depending on the computer/phones actual CPU speed, so you should measure this on the same type of the device that your user is using. To debug you should use the Chrome timeline log and drag/drop it into devtools or use Firefox Geckoprofiler.
cacheHeadersThe page has 6 requests that are missing a cache time. Configure a cache time so the browser doesn't need to download them every time. It will save 202.8 kB the next access.
The easiest way to make your page fast is to avoid doing requests to the server. Setting a cache header on your server response will tell the browser that it doesn't need to download the asset again during the configured cache time! Always try to set a cache time if the content doesn't change for every request.
avoidRenderBlockingThe page has 9 blocking requests and 0 in body parser blocking (5 JavaScript and 4 CSS).
The critical rendering path is what the browser needs to do to start rendering the page. Every file requested inside of the head element will postpone the rendering of the page, because the browser need to do the request. Avoid loading JavaScript synchronously inside of the head (you should not need JavaScript to render the page), request files from the same domain as the main document (to avoid DNS lookups) and inline CSS for really fast rendering and a short rendering path.
decodingAsyncThe page has 2 images (out of 4) without a decoding hint. Add decoding="async" to non-critical images so the browser can decode them off the main thread.
Setting decoding="async" on an <img> tells the browser it can decode the image off the main thread, which keeps the page responsive to user interactions while images are being processed. The default ("auto") leaves the choice to the browser. https://developer.mozilla.org/en-US/docs/Web/HTML/Element/img#decoding
faviconThe favicon has no cache time.
It is easy to make the favicon big but please avoid doing that, because every browser will then perform an unnecessarily large download. And make sure the cache headers are set for a long time for the favicon. It is easy to miss since it's another content type.
optimalCssSizehttps://www.siarv.it/siar/wp-content/cache/minify/52458.css size is 65.5 kB (65459) and that is bigger than the limit of 25 kB. https://www.siarv.it/siar/wp-content/cache/minify/3bcfd.css size is 167.1 kB (167110) and that is bigger than the limit of 25 kB. Try to keep each CSS response under 25 kB.
Render-blocking CSS holds up the first paint until it has fully downloaded, parsed and applied, so smaller CSS files mean a faster start. Split your CSS into a small critical bundle inlined or eagerly loaded, with the rest lazy-loaded.
| URL | Transfer | Content |
|---|---|---|
| https://www.siarv.it/siar/wp-content/cache/minify/52458.css | 63.9 KB | 377.3 KB |
| https://www.siarv.it/siar/wp-content/cache/minify/3bcfd.css | 163.2 KB | 1.2 MB |
cacheHeadersLongThe page has 15 requests that have a shorter cache time than one year (but still a cache time).
Setting a cache header is good. Setting a long cache header (a year) is even better because the asset will stay in the browser cache across visits. For content-hashed URLs (e.g. app.4af2.css) you can safely use Cache-Control: max-age=31536000, immutable. For unversioned URLs that may change, use a revalidating strategy instead.
inlineCssThe page has both inline styles as well as it is requesting 4 CSS files inside of the head. Let's only inline CSS for really fast render.
In the early days of the Internet, inlining CSS was one of the ugliest things you can do. That has changed if you want your page to start rendering fast for your user. Always inline the critical CSS when you use HTTP/1 and HTTP/2 (avoid doing CSS requests that block rendering) and lazy load and cache the rest of the CSS. It is a little more complicated when using HTTP/2. Does your server support HTTP push? Then maybe that can help. Do you have a lot of users on a slow connection and are serving large chunks of HTML? Then it could be better to use the inline technique, becasue some servers always prioritize HTML content over CSS so the user needs to download the HTML first, before the CSS is downloaded.
privateAssetsThe page has 1 request with private headers. Make sure that the assets really should be private and only used by one user. Otherwise, make it cacheable for everyone.
If you set private headers on content, that means that the content are specific for that user. Static content should be able to be cached and used by everyone. Avoid setting the cache header to private.
metaDescriptionThe page is missing a meta description.
Use a page description to make the page more relevant to search engines.
thirdPartyThe page do 16% requests to third party domains (4 requests and 188 kB). First party is 21 requests and 902.7 kB. The regex .*siarv.* was used to calculate first/third party requests.
Do not load most of your content from third party URLs.
unnecessaryHeadersThere are 16 responses that sets both a max-age and expires header. There are 2 responses that sets a pragma no-cache header (that is a request header). There are 10 responses that sets a server header.
Do not send headers that you don't need. We look for p3p, cache-control and max-age, pragma, server and x-frame-options headers. Have a look at Andrew Betts - Headers for Hackers talk as a guide https://www.youtube.com/watch?v=k92ZbrY815c or read https://www.fastly.com/blog/headers-we-dont-want.
gaThe page is using Google Analytics meaning you share your users private information with Google. You should use analytics that care about user privacy, something like https://matomo.org.
Google Analytics share private user information with Google that your user hasn't agreed on sharing.
referrerPolicyNo <meta name="referrer"> tag was found on the page. Set a Referrer-Policy response header (preferred) or add a meta tag, for example <meta name="referrer" content="strict-origin-when-cross-origin">.
Without an explicit referrer policy the browser falls back to the user-agent default and may leak the full URL of the previous page (including query strings) to every cross-origin request. Set a Referrer-Policy response header (preferred) or a <meta name="referrer"> tag in the document. https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Referrer-Policy
surveillanceThe page embeds 2 resources from companies that profit from user surveillance. Consider privacy-respecting alternatives.
Embedding scripts or iframes from companies whose business model is surveillance capitalism (Google, Facebook, etc.) leaks detailed user data on every page view, often before the user has had a chance to consent. See https://en.wikipedia.org/wiki/Surveillance_capitalism for background. Prefer privacy-respecting alternatives where possible.
contentSecurityPolicyHeaderSet a Content-Security-Policy header to mitigate cross-site scripting attacks. You can start with a Content-Security-Policy-Report-Only header, which only reports violations rather than blocking them.
A Content-Security-Policy response header tells the browser which sources of script, style, and other content are allowed. The most effective form is a strict CSP using nonces or hashes together with strict-dynamic; the worst is a missing header, with unsafe-inline and unsafe-eval close behind. https://web.dev/articles/strict-csp
crossOriginEmbedderPolicyHeaderSet a Cross-Origin-Embedder-Policy header (typically require-corp or credentialless) on the document response to control cross-origin embedding.
Cross-Origin-Embedder-Policy (COEP) makes the page refuse to load cross-origin subresources unless they explicitly opt in via CORP or CORS. Together with Cross-Origin-Opener-Policy it puts the page in a cross-origin isolated context, which mitigates cross-window side-channel attacks (Spectre) and unlocks high-resolution timers and SharedArrayBuffer. https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Cross-Origin-Embedder-Policy
crossOriginOpenerPolicyHeaderSet a Cross-Origin-Opener-Policy header (typically same-origin) on the document response to isolate the page from cross-origin windows.
Cross-Origin-Opener-Policy (COOP) lets a page sever its window-group ties to cross-origin documents that opened it or that it opens. Together with Cross-Origin-Embedder-Policy it puts the page in a cross-origin isolated context, which mitigates cross-window side-channel attacks (Spectre) and unlocks high-resolution timers and SharedArrayBuffer. https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Cross-Origin-Opener-Policy
crossOriginResourcePolicyHeaderSet a Cross-Origin-Resource-Policy header (same-origin, same-site or cross-origin) on the document response to limit who may embed it.
Cross-Origin-Resource-Policy (CORP) is a per-response opt-in that tells the browser which origins are allowed to embed the resource. It blocks cross-origin or cross-site no-cors embedding (img, script, iframe, etc.) and is one of the building blocks of cross-origin isolation. https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Cross-Origin-Resource-Policy
nelHeaderSet a NEL header (paired with Reporting-Endpoints) to collect connection-level error reports from the field.
The NEL (Network Error Logging) response header tells the browser to record connection-level failures (DNS, TLS, HTTP errors) and ship them to a reporting endpoint. NEL pairs with the Reporting-Endpoints / Report-To header — the page declares the endpoint group and NEL points at it. Together they give you visibility into errors that never reach your origin server. https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/NEL
referrerPolicyHeaderSet a referrer-policy header to make sure you do not leak user information.
Referrer Policy is a new header that allows a site to control how much information the browser includes with navigations away from a document and should be set by all sites. https://scotthelme.co.uk/a-new-security-header-referrer-policy/.
reportingEndpointsHeaderSet a Reporting-Endpoints header (or the legacy Report-To header) so CSP reports, NEL data and other Reporting-API events have an endpoint to land at.
The Reporting-Endpoints response header (the successor to Report-To) names the URLs that browsers should POST reports to. Without it, CSP report-to directives, Cross-Origin-Opener-Policy reports, NEL data and other Reporting-API events have nowhere to go. The legacy Report-To header is still accepted for older Chromium versions. https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Reporting-Endpoints
strictTransportSecurityHeaderSet a strict transport header to make sure the user always use HTTPS.
The HTTP Strict-Transport-Security response header (often abbreviated as HSTS) lets a web site tell browsers that it should only be accessed using HTTPS, instead of using HTTP. https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Strict-Transport-Security.
thirdPartyPrivacyThe page has 16% requests that are 3rd party (4 requests with a size of 188 kB). The page also have request to companies that harvest data from users and do not respect users privacy (see https://en.wikipedia.org/wiki/Surveillance_capitalism). The page do 3 analytics requests and uses 1 analytics tool. The page do 4 survelliance requests and uses 2 survelliance tools. The page do 4 surveillance requests and uses 2 surveillance tools. The page do 1 tag-manager request and uses 1 tag-manager tool.
Using third party requests shares user information with that third party. Please avoid that! The project https://github.com/patrickhulce/third-party-web is used to categorize first/third party requests.
xContentTypeOptionsHeaderSet X-Content-Type-Options: nosniff on the document response to prevent MIME-sniffing.
X-Content-Type-Options: nosniff prevents browsers from interpreting files as a different MIME type than what is declared in the Content-Type header. This blocks a class of cross-site scripting and content-type confusion attacks and should be set on every response. https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/X-Content-Type-Options
A snapshot of what the browser actually built for this page: the document, how big and deep the DOM tree is and what it kept in storage. Big, deep trees are slower to style and lay out, so the counts Chrome warns about carry a flag.
Document
What the page says it is and how large it rendered.
DOM structure
How much markup the browser has to build, style and lay out.
What the page stored on the client, and the network it was tested on.
Data collected using
Coach-core version 9.2.1. With updated code from
Webappanalyzer 2026-05-04. Use
--browsertime.firefox.includeResponseBodies html or
--browsertime.chrome.includeResponseBodies html to help Wappalyzer find more information about technologies used.
Data collected using Third Party Web version 0.29.2.
0.0s0.3s0.5s0.6sWhen the page main content is rendered, collected via the Largest Contentful Paint API. Read more about Largest Contentful Paint.
body > div:eq(1) > div#main > div > div > div > div#content > div:eq(0) > div > div > div > div > div > img
The LCP element is highlighted in the screenshot. If nothing is highlighted the element was removed before the screenshot or the LCP API couldn't find it.
The Largest Contentful Paint API matched this image:
How much the page's content shifts as it loads, collected via the Cumulative Layout Shift API.
One shift is 100% of your 0.031 CLS. div:eq(0) moved at 467 ms. Reserve space for whatever renders into that spot, a fixed height or an aspect-ratio box, so later content stops pushing the page around.
Worst first, showing shifts of 0.01 and up. Each percentage is that shift's exact share of the score.
body > div:eq(1) > div#main > div > div > div > div#content > div:eq(0)body > div:eq(1) > div:eq(2) > div#footerbody > div:eq(1) > div:eq(2) > div#footer > div:eq(0) > div > div > div:eq(0)body > div:eq(1) > div:eq(2) > div#footer > div:eq(0) > div > div > div:eq(1)
Elements that shifted by more than 0.01 are highlighted in the screenshot. If an element shifted outside the viewport, it won't appear here. Check the video or filmstrip to see the shift.
There are no custom configured scripts.
There are no custom extra metrics from scripting.
How the page is built.
https://www.siarv.it/block/sfondo-chi-siamo/
| Header | Value |
|---|---|
connection | keep-alive |
content-encoding | gzip |
content-length | 16058 |
content-type | text/html; charset=UTF-8 |
date | Thu, 15 Oct 2026 20:14:33 GMT |
link | <https://www.siarv.it/wp-json/>; rel="https://api.w.org/", <https://www.siarv.it/wp-json/wp/v2/block/4329>; rel="alternate"; title="JSON"; type="application/json", <https://www.siarv.it/?p=4329>; rel=shortlink |
permissions-policy | private-state-token-redemption=(self "https://www.google.com" "https://www.gstatic.com" "https://recaptcha.net" "https://challenges.cloudflare.com" "https://hcaptcha.com"), private-state-token-issuance=(self "https://www.google.com" "https://www.gstatic.com" "https://recaptcha.net" "https://challenges.cloudflare.com" "https://hcaptcha.com") |
upgrade | h2,h2c |
vary | Accept-Encoding |
x-cache-status | HIT |
x-served-by | www.siarv.it |
x-w3tc-cdn | ftp |
Transfer size1.0 MB
Content size3.9 MB
Requests25
| Content | Header Size | Transfer Size | Content Size | Requests |
|---|---|---|---|---|
| html | 853 B | 15.7 KB | 60.5 KB | 1 |
| css | 1.5 KB | 234.4 KB | 1.6 MB | 4 |
| javascript | 4.3 KB | 621.6 KB | 2.1 MB | 13 |
| image | 1.1 KB | 191.8 KB | 191.8 KB | 4 |
| favicon | 284 B | 1.1 KB | 1.1 KB | 1 |
| plain | 0 b | 463 B | 15 B | 2 |
| Total | 8.0 KB | 1.0 MB | 3.9 MB | 25 |
| Domain | Total download time | Transfer Size | Content Size | Requests |
|---|---|---|---|---|
| www.siarv.it | 661 ms | 683.5 KB | 3.2 MB | 15 |
| cdn.siarv.it | 240 ms | 198.0 KB | 211.8 KB | 6 |
| www.google-analytics.com | 165 ms | 21.4 KB | 51.1 KB | 2 |
| www.googletagmanager.com | 203 ms | 162.2 KB | 466.7 KB | 1 |
| region1.google-analytics.com | 101 ms | N/A | 0 b | 1 |
| type | min | median | max |
|---|---|---|---|
| Expires | 0 seconds | 4 weeks | 4 weeks |
| Last modified | 4 weeks | 31 weeks | 28 years |
Includes requests done after load event end.
| Content | Transfer Size | Requests |
|---|---|---|
| html | 0 b | 0 |
| css | 0 b | 0 |
| javascript | 167.3 KB | 2 |
| image | 0 b | 0 |
| font | 0 b | 0 |
| favicon | 1.1 KB | 1 |
| plain | 0 b | 1 |
| Total | 168.4 KB | 4 |
Includes requests done after DOM content loaded.
| Content | Transfer Size | Requests |
|---|---|---|
| html | 0 b | 0 |
| css | 0 b | 0 |
| javascript | 167.3 KB | 2 |
| image | 0 b | 0 |
| font | 0 b | 0 |
| favicon | 1.1 KB | 1 |
| plain | 463 B | 2 |
| Total | 168.9 KB | 5 |
Third party requests categorised by Third party web version 0.29.2.
Requests by category8
Transfer size1.0 MB
Content size3.9 MB
Requests25
Calculated using .*siarv.* (use --firstParty to configure).
| Content | Header Size | Transfer Size | Content Size | Requests |
|---|---|---|---|---|
| html | 853 B | 15.7 KB | 60.5 KB | 1 |
| css | 1.5 KB | 234.4 KB | 1.6 MB | 4 |
| javascript | 4.3 KB | 438.4 KB | 1.6 MB | 11 |
| image | 1.1 KB | 191.8 KB | 191.8 KB | 4 |
| font | 0 b | 0 b | 0 b | 0 |
| favicon | 284 B | 1.1 KB | 1.1 KB | 1 |
| Total | 8.0 KB | 881.5 KB | 3.4 MB | 21 |
| Content | Header Size | Transfer Size | Content Size | Requests |
|---|---|---|---|---|
| html | 0 b | 0 b | 0 b | 0 |
| css | 0 b | 0 b | 0 b | 0 |
| javascript | 0 b | 183.2 KB | 517.8 KB | 2 |
| image | 0 b | 0 b | 0 b | 0 |
| font | 0 b | 0 b | 0 b | 0 |
| favicon | 0 b | 0 b | 0 b | 0 |
| plain | 0 b | 463 B | 15 B | 2 |
| Total | N/A | 183.6 KB | 517.8 KB | 4 |