Watch for changes
computerhistory.org loads faster with WebSpeed
Measured PageSpeed before and after WebSpeed optimization — no plugins, no migration.
Speed Index from a single check. Repeat checks of the same page typically differ by around 30%, so read the two times as a direction, not a precise multiplier.
From the measured LCP gain: −9.0 s.
Core Web Vitals are a Google ranking signal, but work as a “tiebreaker” — they matter most when two pages are roughly equal in relevance and content. The biggest SEO benefit comes from moving out of the Poor zone (score < 50).
From the measured LCP gain: −9.0 s.
Google / Deloitte (2019): 0.1 s improvement → +8% conversions in retail. Portent: each extra second of load time reduces conversion rate ~4%.
From the measured LCP gain: −9.0 s.
Based on Google data: pages loading in 3 s vs 1 s show ~32% higher bounce rate. Estimate scales proportionally to LCP improvement and is site-specific.
From the measured page weight: ≈ 2.7 → 1.5 g per visit.
Transferred bytes × ≈0.5 g of CO₂ per MB, a common average for networks and devices. The real figure depends on the hosting and the visitor’s connection.
Forecasts, not measurements: measured gains × published studies — tap any underlined label for the source.
Lighthouse recording of the original page under real mobile throttling. The right panel replays the same frames at the measured Speed Index ratio (5.4× faster). Played back 1.6× faster than real time — both panels equally.
Fastest quarter 77+ · you 29
Fastest quarter 96+ · you 64
Fastest quarter ≤ 3.4 s · you 11.7 s
Fastest quarter ≤ 0.9 s · you 1.2 s
Fastest quarter ≤ 4.0 s · you 21.3 s
Fastest quarter ≤ 0.9 s · you 1.6 s
Fastest quarter ≤ 1.5 MB · you 5.4 MB
Fastest quarter ≤ 1.7 MB · you 5.5 MB
Based on 1664 WordPress sites WebSpeed has measured, as they are, without our optimization. Cards marked “all platforms” compare with all 5575 sites we’ve measured, not just WordPress ones. Updated 28 Oct 2026.
Speed
what the visitor sees| Metric | Now | Fast | Δ |
|---|---|---|---|
| PageSpeed scoreblends the five below | 29 | 80 | +51 |
| First Contentful Paint. The moment the browser renders the first piece of real content — the first sign to the visitor that the page is loading.≤ 1.8s | 11.7 s | 2.1 s | −82% |
| Largest Contentful Paint. The time it takes for the largest image or text block in the viewport to render — one of Google's three Core Web Vitals.≤ 2.5s | 21.3 s | 3.9 s | −82% |
| How quickly the visible part of the page fills in during load, averaged over time — a lab metric that rewards showing content sooner.≤ 3.4s | 11.7 s | 2.2 s | −81% |
| Total Blocking Time. The total time the main thread was blocked by long tasks during load — the lab metric that stands in for real-world responsiveness.≤ 200ms | 1,620 ms | 290 ms | −82% |
| Cumulative Layout Shift. A score for how much visible content unexpectedly jumps around while the page loads — one of Google's three Core Web Vitals.≤ 0.1 | 0 | 0 | No change beyond run-to-run noise. |
| LCP breakdownobserved load, no throttling | |||
| What the largest visible element was — an image or a block of text. The two are sped up by different means. | Image | Image | same |
| Time until the first byte of the HTML arrived.TTFB | 2 ms | 5 ms | No change beyond run-to-run noise. |
| Time between the first byte and the moment the browser started downloading the LCP image. Long when the image is found late — lazy-loaded, set from CSS or JS.until the image is requested | 48 ms | 74 ms | No change beyond run-to-run noise. |
| Time spent downloading the LCP image itself — its weight and the connection.downloading the image | 167 ms | 37 ms | −78% |
| Time between the resource being ready and the element being painted — blocked by CSS, fonts or scripts.until it is painted | 2.1 s | 180 ms | −91% |
Page weight
loaded during the test| Metric | Now | Fast | Δ |
|---|---|---|---|
| Files the browser downloaded during the test. | 154 | 94 | −60 |
| The page itself, before anything it references. | 487 KB | 443 KB | −51% |
| Scripts downloaded during the test. Fewer can mean deferred past the test window, not removed from the site. | 452.8 MB | 231.3 MB | −53% |
| Stylesheets downloaded during the test. | 10119 KB | 6101 KB | −15% |
| Web font files downloaded during the test. | 5151 KB | 7213 KB | +41% |
| Images downloaded during the test. Images below the fold may load later, after the test. | 491.6 MB | 45857 KB | −48% |
| Third-partyother companies’ servers | |||
| Distinct third-party domains the page downloaded from — analytics, chat, embeds, fonts, CDNs. | 40 | 17 | −23 |
| Bytes downloaded from those third-party domains. | 3.5 MB | 1.3 MB | −64% |
What holds the main thread
Lighthouse attribution, lab run| Time a script kept the browser busy beyond 50 ms per task — the same pieces Lighthouse adds up into Total Blocking Time. While it lasts, taps and clicks wait. Counted on the recorded run, so the total can differ from the simulated TBT above. | Now | Fast |
|---|---|---|
| Google Tag Manager, plus the tags it loads: analytics, ads, chat. Time counts here when it runs inside GTM’s own script. Fast does not remove it: every tag still fires.Third-party service · Tag manager | 1,237 ms | 0 ms |
| Google CDNThird-party service · CDN | 806 ms | 474 ms |
| Facebook Pixel, the ad-tracking script. While the page loads it sets itself up and reads the page, and the browser cannot react to taps meanwhile. Fast does not remove it: tracking keeps working.Third-party service · Social | 305 ms | 0 ms |
| The site’s own scripts, plugins and services not listed above (each under 50 ms or past the top three), and browser work Lighthouse could not tie to any script.Site’s own code, smaller scripts, unattributed | 235 ms | 83 ms |
Fast removes nothing: every script still loads and runs, and Fast starts what it safely can after the page is ready to use.
Each number comes from one lab run. A script that ran after the run ended shows 0 ms.
Already on this site
Original page, before Fast- PantheonManaged hosting with server page cache · effect on this page not measured
- CloudflareCDN · effect on this page not measured
- Main image is marked high priorityMissing
- Images are in modern formats and sized to the screenMissingLighthouse estimate: −1.4 s LCP
- No CSS or JS holds back the first paintMissing
- Static files are cached in the browserMissing
- Text stays visible while web fonts loadMissing
- Main image is in the HTML, not added by a scriptOK
- Main image is not lazy-loadedOK
- CSS and JS are minifiedOK
- The page is compressed (gzip or brotli)OK
- Admin area
/wp-admin/and/wp-login.phppass through Fast unchanged and are never cached
Tools are recognised from the page’s code and response headers. A tool that leaves no trace there is not listed.
A CDN or a host serves every request and cannot be switched off for a single test run, so there is nothing to compare its effect against.
“OK” means Lighthouse found nothing to fix on the original page — not that someone switched it on.
Savings are Lighthouse’s own estimates for the original page, not measured by us.
Speed
what the visitor sees| Metric | Now | Fast | Δ |
|---|---|---|---|
| PageSpeed scoreblends the five below | 64 | 94 | +30 |
| First Contentful Paint. The moment the browser renders the first piece of real content — the first sign to the visitor that the page is loading.≤ 1.8s | 0.9 s | 0.6 s | −35% |
| Largest Contentful Paint. The time it takes for the largest image or text block in the viewport to render — one of Google's three Core Web Vitals.≤ 2.5s | 1.6 s | 1.0 s | −37% |
| How quickly the visible part of the page fills in during load, averaged over time — a lab metric that rewards showing content sooner.≤ 3.4s | 1.2 s | 0.7 s | −39% |
| Total Blocking Time. The total time the main thread was blocked by long tasks during load — the lab metric that stands in for real-world responsiveness.≤ 200ms | 1,070 ms | 180 ms | −83% |
| Cumulative Layout Shift. A score for how much visible content unexpectedly jumps around while the page loads — one of Google's three Core Web Vitals.≤ 0.1 | 0.009 | 0 | No change beyond run-to-run noise. |
| LCP breakdownobserved load, no throttling | |||
| What the largest visible element was — an image or a block of text. The two are sped up by different means. | Image | Image | same |
| Time until the first byte of the HTML arrived.TTFB | 4 ms | 14 ms | No change beyond run-to-run noise. |
| Time between the first byte and the moment the browser started downloading the LCP image. Long when the image is found late — lazy-loaded, set from CSS or JS.until the image is requested | 42 ms | 52 ms | No change beyond run-to-run noise. |
| Time spent downloading the LCP image itself — its weight and the connection.downloading the image | 64 ms | 42 ms | No change beyond run-to-run noise. |
| Time between the resource being ready and the element being painted — blocked by CSS, fonts or scripts.until it is painted | 291 ms | 211 ms | No change beyond run-to-run noise. |
Page weight
loaded during the test| Metric | Now | Fast | Δ |
|---|---|---|---|
| Files the browser downloaded during the test. | 153 | 94 | −59 |
| The page itself, before anything it references. | 487 KB | 443 KB | −51% |
| Scripts downloaded during the test. Fewer can mean deferred past the test window, not removed from the site. | 452.8 MB | 231.8 MB | −36% |
| Stylesheets downloaded during the test. | 10119 KB | 6101 KB | −15% |
| Web font files downloaded during the test. | 5151 KB | 7213 KB | +41% |
| Images downloaded during the test. Images below the fold may load later, after the test. | 491.7 MB | 46903 KB | −47% |
| Third-partyother companies’ servers | |||
| Distinct third-party domains the page downloaded from — analytics, chat, embeds, fonts, CDNs. | 40 | 17 | −23 |
| Bytes downloaded from those third-party domains. | 3.5 MB | 1.7 MB | −51% |
What holds the main thread
Lighthouse attribution, lab run| Time a script kept the browser busy beyond 50 ms per task — the same pieces Lighthouse adds up into Total Blocking Time. While it lasts, taps and clicks wait. Counted on the recorded run, so the total can differ from the simulated TBT above. | Now | Fast |
|---|---|---|
| Google Tag Manager, plus the tags it loads: analytics, ads, chat. Time counts here when it runs inside GTM’s own script. Fast does not remove it: every tag still fires.Third-party service · Tag manager | 738 ms | 0 ms |
| Google CDNThird-party service · CDN | 388 ms | 389 ms |
| Facebook Pixel, the ad-tracking script. While the page loads it sets itself up and reads the page, and the browser cannot react to taps meanwhile. Fast does not remove it: tracking keeps working.Third-party service · Social | 153 ms | 0 ms |
| The site’s own scripts, plugins and services not listed above (each under 50 ms or past the top three), and browser work Lighthouse could not tie to any script.Site’s own code, smaller scripts, unattributed | 7 ms | 12 ms |
Fast removes nothing: every script still loads and runs, and Fast starts what it safely can after the page is ready to use.
Each number comes from one lab run. A script that ran after the run ended shows 0 ms.
Already on this site
Original page, before Fast- PantheonManaged hosting with server page cache · effect on this page not measured
- CloudflareCDN · effect on this page not measured
- Main image is marked high priorityMissing
- Images are in modern formats and sized to the screenMissingLighthouse estimate: −200 ms LCP
- No CSS or JS holds back the first paintMissing
- Static files are cached in the browserMissing
- Text stays visible while web fonts loadMissing
- Main image is in the HTML, not added by a scriptOK
- Main image is not lazy-loadedOK
- CSS and JS are minifiedOK
- The page is compressed (gzip or brotli)OK
- Admin area
/wp-admin/and/wp-login.phppass through Fast unchanged and are never cached
Tools are recognised from the page’s code and response headers. A tool that leaves no trace there is not listed.
A CDN or a host serves every request and cannot be switched off for a single test run, so there is nothing to compare its effect against.
“OK” means Lighthouse found nothing to fix on the original page — not that someone switched it on.
Savings are Lighthouse’s own estimates for the original page, not measured by us.
PageSpeed scores are measured by Google PageSpeed Insights and are not guaranteed: they vary run to run and depend on network, device and third-party code. How to read this report
PageSpeed 29 → 80 on mobile and 64 → 94 on desktop, the screen fills in 2.2 s instead of 11.7 s on mobile and the page weighs 3 MB instead of 5.4 MB.
Still on the site itself: the main image is not marked high priority, images are not in modern formats or sized to the screen, CSS or JS holds back the first paint, and 2 more — listed under “Already on this site” in Speed metrics.
Get this speed for your visitors — WebSpeed Fast, 14 days free. Edit the page code yourself — the report lists the changes.
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