839 ms in total
58 ms
378 ms
403 ms
Welcome to concertina.com homepage info - get ready to check Concertina best content for United States right away, or after learning these important things about concertina.com
Concertina Library: Documents for the study of English, Anglo, and Duet concertinas; history, instruction books, sheet music, patents, technical papers, rare periodicals, and new research by many lead...
Visit concertina.comWe analyzed Concertina.com page load time and found that the first response time was 58 ms and then it took 781 ms to load all DOM resources and completely render a web page. This is quite a good result, as only 15% of websites can load faster.
concertina.com performance score
name
value
score
weighting
Value2.0 s
84/100
10%
Value5.4 s
20/100
25%
Value2.0 s
99/100
10%
Value20 ms
100/100
30%
Value0
100/100
15%
Value2.0 s
99/100
10%
58 ms
84 ms
26 ms
30 ms
3 ms
Our browser made a total of 50 requests to load all elements on the main page. We found that 96% of them (48 requests) were addressed to the original Concertina.com, 4% (2 requests) were made to Google-analytics.com. The less responsive or slowest element that took the longest time to load (107 ms) belongs to the original domain Concertina.com.
Page size can be reduced by 56.3 kB (23%)
244.1 kB
187.8 kB
In fact, the total size of Concertina.com main page is 244.1 kB. This result falls beyond the top 1M of websites and identifies a large and not optimized web page that may take ages to load. 15% of websites need less resources to load. Images take 177.5 kB which makes up the majority of the site volume.
Potential reduce by 46.9 kB
HTML content can be minified and compressed by a website’s server. The most efficient way is to compress content using GZIP which reduces data amount travelling through the network between server and browser. This page needs HTML code to be minified as it can gain 15.8 kB, which is 26% of the original size. It is highly recommended that content of this web page should be compressed using GZIP, as it can save up to 46.9 kB or 79% of the original size.
Potential reduce by 8.4 kB
Image size optimization can help to speed up a website loading time. The chart above shows the difference between the size before and after optimization. Concertina images are well optimized though.
Potential reduce by 971 B
It’s better to minify JavaScript in order to improve website performance. The diagram shows the current total size of all JavaScript files against the prospective JavaScript size after its minification and compression. It is highly recommended that all JavaScript files should be compressed and minified as it can save up to 971 B or 14% of the original size.
Number of requests can be reduced by 3 (6%)
48
45
The browser has sent 48 CSS, Javascripts, AJAX and image requests in order to completely render the main page of Concertina. We recommend that multiple CSS and JavaScript files should be merged into one by each type, as it can help reduce assets requests from 4 to 1 for CSS and as a result speed up the page load time.
concertina.com
58 ms
www.concertina.com
84 ms
concertina.css
26 ms
concertina.js
30 ms
urchin.js
3 ms
null.css
13 ms
concertina-adv.css
27 ms
__utm.gif
8 ms
bg-site-graygreen.gif
14 ms
www-concertina-com-logo-W120H150.jpg
15 ms
btn_go.gif
13 ms
shadebg.gif
26 ms
bolton-english-concertina-band-1910-W100H68.jpg
27 ms
concertinanetforums-W100H75.jpg
28 ms
icon-link-W19H23.gif
29 ms
icon-doc-W19H23.gif
29 ms
conduit-street-1900-pocket-atlas-london-W100H100.jpg
46 ms
archives-murray-and-scriptorium-W100H92.jpg
38 ms
two-level-concertinists-W100H68.jpg
39 ms
feed-icon-W32H32.png
38 ms
Tea-mug-thumb-b-H57W56.gif
44 ms
new-W23H12.gif
45 ms
home-in-ireland-W100H134.png
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goldbg.gif
51 ms
allan-atlas-performs-on-victorian-concertina-W100H125.png
51 ms
anglous-ottinger-W100H138.png
57 ms
cover-rma-research-chronicle-39-W100H130.jpg
57 ms
charles-jeffries-1841-1906-W100H113.jpg
58 ms
Marie-Lachenal-with-concertina-W100H143.jpg
63 ms
eydmann-life-and-times-postcard-W100H158.jpg
63 ms
concert-in-a-building-site-W100H138.jpg
64 ms
Nomenclature-W200H67.jpg
71 ms
english-wheatstone-c1830-W100H95.jpg
71 ms
figures-from-sheard-tutor-W100H75.jpg
72 ms
trademark-1892-emerald-W100H60.jpg
74 ms
concertina-stand-W100H160.gif
75 ms
reuben-shaw-fingering-W100H75.jpg
76 ms
Lachenal-1746-M-with-red-labels-cropped-shadowed-W125H93.jpg
85 ms
Alexander-Prince-W100H141.jpg
86 ms
Duet-Wh-27170-1935-W100H83.jpg
86 ms
Jeffries-Right-Reed-Pan-Top-W100H85.jpg
87 ms
research-page-Q07-Left-side-with-scale-thumb-W100H75.jpg
88 ms
hiawathas-photographing-W100H96.jpg
89 ms
Wh-Calendar-1923-sq-corners-W100H161.jpg
107 ms
c1056-p76-lachenal-sig-W100H125.jpg
99 ms
lark-am-pricelist-1960s-W100H73.jpg
98 ms
pocket-adding-machine-W100H144.jpg
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reed-tuning-at-factory-W100H75.jpg
86 ms
barleycorn-at-witney-sept1999-W100H131.jpg
85 ms
print.css
14 ms
concertina.com accessibility score
Contrast
These are opportunities to improve the legibility of your content.
Impact
Issue
Background and foreground colors do not have a sufficient contrast ratio.
Tables and lists
These are opportunities to improve the experience of reading tabular or list data using assistive technology, like a screen reader.
Impact
Issue
<dl>'s do not contain only properly-ordered <dt> and <dd> groups, <script>, <template> or <div> elements.
Navigation
These are opportunities to improve keyboard navigation in your application.
Impact
Issue
Heading elements are not in a sequentially-descending order
Internationalization and localization
These are opportunities to improve the interpretation of your content by users in different locales.
Impact
Issue
<html> element does not have a [lang] attribute
Names and labels
These are opportunities to improve the semantics of the controls in your application. This may enhance the experience for users of assistive technology, like a screen reader.
Impact
Issue
Form elements do not have associated labels
concertina.com best practices score
Trust and Safety
Impact
Issue
Does not use HTTPS
Ensure CSP is effective against XSS attacks
User Experience
Impact
Issue
Serves images with low resolution
concertina.com SEO score
Crawling and Indexing
To appear in search results, crawlers need access to your app.
Impact
Issue
robots.txt is not valid
EN
N/A
UTF-8
Language claimed in HTML meta tag should match the language actually used on the web page. Otherwise Concertina.com can be misinterpreted by Google and other search engines. Our service has detected that English is used on the page, and neither this language nor any other was claimed in <html> or <meta> tags. Our system also found out that Concertina.com main page’s claimed encoding is utf-8. Use of this encoding format is the best practice as the main page visitors from all over the world won’t have any issues with symbol transcription.
concertina.com
Open Graph description is not detected on the main page of Concertina. Lack of Open Graph description can be counter-productive for their social media presence, as such a description allows converting a website homepage (or other pages) into good-looking, rich and well-structured posts, when it is being shared on Facebook and other social media. For example, adding the following code snippet into HTML <head> tag will help to represent this web page correctly in social networks: