genscript.com.cn website review

87 files are served with short cache lifetimes, so returning visitors download them again (4.0 MB).

20 files block the first paint until they finish downloading. Deferring or inlining them could save about 3.5 s.

About 424 KiB of JavaScript is downloaded but never used on this page. Google estimates it would make the page about 1.8 s faster on a phone.

Your mobile performance score is 29. Under 50 is Google's “poor” band: many phone visitors leave before the page is usable.

A phone's processor spends 4.6 s on main-thread work while loading, 2.2 s of it running JavaScript. Above 2 s, taps and scrolls feel sluggish.

21 images could be 1.8 MB smaller with modern formats (WebP or AVIF) and sizes that fit a phone screen. Google estimates it would make the page about 350 ms faster on a phone.

8 third-party services load with your homepage (Google Tag Manager, Facebook and Google Analytics and others), adding 766 KiB and 1.2 s of main-thread time.

Google Tag Manager costs a phone 459 ms of main-thread work and 318 KiB of downloads while your page loads. Loading it after the page is usable, or only on the pages that need it, takes that off the critical path.

About 58 KiB of CSS is downloaded but never applied on this page. Google estimates it would make the page about 300 ms faster on a phone.

18 long tasks block the main thread while loading, the longest for 333 ms. During a long task the page ignores taps.

The page has 1,650 HTML elements. Above 1,500, rendering and every interaction get slower on phones.

Polyfills for old browsers add 13 KiB JavaScript that modern phones do not need. Google estimates it would make the page about 50 ms faster on a phone.

Critical files load one after another instead of in parallel (3 chains). Preconnecting to key origins and preloading the hero image shortens the chain.

Scripts make the browser recalculate the layout repeatedly while the page loads, which wastes processor time on phones.

Real Chrome users on phones do not pass Google's Core Web Vitals on this page (28-day field data from the Chrome UX Report (opens in a new tab)). Google uses this in ranking.

Your largest element takes 15.4 s to render on a phone. Google's threshold for “good” is 2.5 s. The largest element is the image.

The page becomes fully interactive after 16.3 s. Good is under 3.8 s.

Visually, the page fills in at 10.3 s (Speed Index). Good is under 3.4 s.

The layout shifts by 0.32 while loading, so content jumps under the reader's thumb. Good is under 0.1.

Scripts block taps and scrolling for 695 ms in total while the page loads. Good is under 200 ms.

Real visitors wait 2.5 s for the largest content to appear (75th percentile). Good is under 2.5 s.

Over the last 25 four-week periods to 2026-10-31, real Chrome visitors' largest content (lcp) went from 1.3 s to 2.6 s at the 75th percentile (Chrome UX Report (opens in a new tab) history).

Real visitors see the first content after 2.2 s (75th percentile). Good is under 1.8 s.

Real visitors wait 1.5 s for your server to start answering (75th percentile). Good is under 800 ms.

The first text or image appears after 2.6 s on a phone. Good is under 1.8 s.

13 images have no width and height attributes, so the layout jumps as each one loads.

Your homepage downloads 4.7 MB in 125 requests on a phone: images 3.5 MB (61), scripts 978 KiB (28) and stylesheets 102 KiB (11). Under 2 MB keeps phones on slow connections fast.

csi-2026-index-pc.jpg weighs 598 KiB. On a phone connection a single image that size takes seconds.

13 images (1.6 MB) are JPEG, PNG or GIF. The same pictures as WebP or AVIF are usually much smaller at the same quality, and every current browser shows them.

1 image is downloaded at several times the size a phone draws it, for example weixin.jpg at 860 px wide, shown at 95 px. Resized copies would save about 88 KiB.

6 images further down the page (295 KiB) download before anyone scrolls to them. Adding loading="lazy" lets the first screen load first.

By the Sustainable Web Design model, a visit to your homepage emits about 1.33 g of CO₂e: 159.3 kg a year at 10,000 visits a month. It scales with page weight, so every byte cut lowers it.

12 text elements don't have enough contrast against the background to read easily, especially outdoors on a phone.

<dl> elements must only directly contain properly-ordered <dt> and <dd> groups, <script>, <template> or <div> elements: 3 elements on the page fail this check, rated serious by axe-core.

3 tap targets are too small or too close together to hit reliably with a finger.

9 images have no alt text, which hurts accessibility and image search.

All page content should be contained by landmarks: 16 elements on the page fail this check, rated moderate by axe-core.

The page has no <main> landmark, so screen-reader users cannot jump straight to the content.

The viewport tag blocks pinch-zoom, which low-vision visitors rely on.

6 visible links have no text or label, so screen readers cannot say where they go.

2 form fields have no label, so screen readers announce an empty box and autofill guesses.

Alternative text of images should not be repeated as text: 3 elements on the page fail this check, rated minor by axe-core.

Your title is only 28 characters: “金斯瑞-基因合成_引物合成_多肽合成_蛋白表达和抗体工程”. Between 30 and 65 characters leaves room to say what you do and for whom.

No structured data (JSON-LD), so Google can't show rich results such as your logo, ratings or FAQs.

There are 29 <h1> headlines (“第十八届全国免疫学学术大会”, “突破想象，编辑未来 OmniGuide RNA” and “用生物技术 使人和自然更健康”). One clear main headline is easier for people and search engines.

No Open Graph image (also missing: og:title, og:description), so links shared on LinkedIn, Slack or Facebook show no preview picture.

No XML sitemap at https://www.genscript.com.cn/sitemap.xml, so Google discovers your pages only by following links.

4 links have no real href, so search engines can't follow them.

No twitter:card tag. X falls back to Open Graph, which is incomplete here.

The homepage links to 382 pages on genscript.com.cn and 10 external pages.

There is no Organization (or LocalBusiness) JSON-LD, so search engines and AI assistants have no machine-readable facts about who runs the site: its name, logo, profiles and contact details.

There is no /llms.txt, a short Markdown guide to your key pages for AI tools (llmstxt.org). It is optional and few AI tools read it yet, so treat it as a cheap extra.

/contact.html has no <h1> headline, so visitors and search engines get no clear main topic.

/mutation-and-library-services.html, /ivt-rna.html, /gene-synthesis-service.html and /ivt-mrna-production.html took over 3 s to send their HTML from our server.

We fetched 15 pages linked from your homepage (of 179 found) and read each the way a search engine does.

8 images failed to load on a phone, for example https://www.genscript.com.cn/gsimages/event/csi-2026-location.jpg.

The page uses 1 deprecated browser API that will stop working in future browsers (“Unload event listeners are deprecated and will be removed.”).

2 errors were logged to the browser console while the page loaded, for example “Failed to load resource: net::ERR_FAILED”.

9 links from your homepage to your own site are broken, for example https://www.genscript.com.cn/ivt-mrna-production.html?src=pullmenu (468).

http://genscript.com.cn does not redirect to https, so some visitors land on the insecure version.

No Content-Security-Policy header, the main browser-side defence against injected scripts.

Neither X-Frame-Options nor a CSP frame-ancestors policy is set, so any site can embed yours in a frame.

HSTS is set, but max-age is 182 days; one year is the recommended minimum.

X-Content-Type-Options: nosniff is missing, so browsers may guess file types.

No Referrer-Policy header, so full URLs can leak to the sites you link to.

No Permissions-Policy header to switch off camera, microphone and location for embedded content.

There is no /.well-known/security.txt telling researchers how to report a security problem to you.

genscript.com.cn has no CAA record, so any certificate authority may issue a certificate for it. A CAA record naming your provider (for example letsencrypt.org) closes that door.

On a phone, there is no call to action on the first screen: visitors have to scroll to find out what to do next.

We found no call-to-action buttons or links (such as “Book a demo” or “Get a quote”) anywhere on the homepage.

Social proof on the homepage: 8 trust badges. Pairing it with named testimonials or customer logos makes it far more convincing.

No phone number or email link on the homepage, so ready-to-buy visitors have one fewer way to reach you.

The homepage has only about 51 words of visible text; thin pages give Google and first-time buyers little to go on.

No guarantee or risk reducer (money-back, free trial, no credit card) is mentioned, which is often what tips a hesitant visitor.

DMARC is set to p=none, so mail pretending to be genscript.com.cn is still delivered. Reports are on, so moving to quarantine is the next step.

Email authentication: SPF record 25 points, plus 15 when it ends in -all (10 for ~all); DMARC record 25, plus 25 for a reject policy (15 for quarantine); a DKIM key on a common selector 10.

Before a visitor clicks anything, the page loads Google Ads, Google Analytics, Google Tag Manager, LinkedIn Insight and Meta Pixel and 2 mores (measured from a US location before any click). No consent tool was detected. Visitors from the EU, UK and several US states must be asked first.

Opening the homepage sets 16 cookies (measured from a US location before any click).

No known cookie consent tool loads with the page. Some sites build their own banner, and some only show one to visitors from the EU.

Loading the homepage contacts 20 hosts run by other companies (fonts, scripts, analytics, ads), each of which sees the visitor's IP address.