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How to Increase Blog Loading with LazySizes

How to Increase Blog Loading with LazySizes



There are many ways to increase the loading of a blog, one of which is by adding the LazySizes script to the blog theme.
Lazysizes is a self-initializing lazyloader that is fast, junk-free and also SEO Friendly for images on blogs and can also be used to lazyload video iFrames such as embedding Youtube videos and videos from other platforms.


For those of you who have a blog with a lot of image and video content, of course this is the right solution to increase blog loading by installing LazySizes because the image or video content will not be loaded (off-screen) before you scroll the page down.

How to Increase Blog Loading with LazySizes is also quite easy, my friend just needs to add this script to the theme and apply it to image or video content on the blog. I have also applied it on Arlina Code 's blog

Also read: How to Remove CSS, Javascript, and Blogger Bundle Widgets

Alright, for those of you who want to add them, please follow these steps:

How to Increase Blog Loading with LazySizes


The first step, open Blogger > Click the Theme menu > Click Edit HTML > Then add the code below before</body>

<script>
                    //<![CDATA[
                    // LazySizes https://github.com/aFarkas/lazysizes
                    !function(e){var t=function(u,D,f){"use strict";var k,H;if(function(){var e;var t={lazyClass:"lazyload",loadedClass:"lazyloaded",loadingClass:"lazyloading",preloadClass:"lazypreload",errorClass:"lazyerror",autosizesClass:"lazyautosizes",srcAttr:"data-src",srcsetAttr:"data-srcset",sizesAttr:"data-sizes",minSize:40,customMedia:{},init:true,expFactor:1.5,hFac:.8,loadMode:2,loadHidden:true,ricTimeout:0,throttleDelay:125};H=u.lazySizesConfig||u.lazysizesConfig||{};for(e in t){if(!(e in H)){H[e]=t[e]}}}(),!D||!D.getElementsByClassName){return{init:function(){},cfg:H,noSupport:true}}var O=D.documentElement,a=u.HTMLPictureElement,P="addEventListener",$="getAttribute",q=u[P].bind(u),I=u.setTimeout,U=u.requestAnimationFrame||I,l=u.requestIdleCallback,j=/^picture$/i,r=["load","error","lazyincluded","_lazyloaded"],i={},G=Array.prototype.forEach,J=function(e,t){if(!i[t]){i[t]=new RegExp("(\\s|^)"+t+"(\\s|$)")}return i[t].test(e[$]("class")||"")&&i[t]},K=function(e,t){if(!J(e,t)){e.setAttribute("class",(e[$]("class")||"").trim()+" "+t)}},Q=function(e,t){var i;if(i=J(e,t)){e.setAttribute("class",(e[$]("class")||"").replace(i," "))}},V=function(t,i,e){var a=e?P:"removeEventListener";if(e){V(t,i)}r.forEach(function(e){t[a](e,i)})},X=function(e,t,i,a,r){var n=D.createEvent("Event");if(!i){i={}}i.instance=k;n.initEvent(t,!a,!r);n.detail=i;e.dispatchEvent(n);return n},Y=function(e,t){var i;if(!a&&(i=u.picturefill||H.pf)){if(t&&t.src&&!e[$]("srcset")){e.setAttribute("srcset",t.src)}i({reevaluate:true,elements:[e]})}else if(t&&t.src){e.src=t.src}},Z=function(e,t){return(getComputedStyle(e,null)||{})[t]},s=function(e,t,i){i=i||e.offsetWidth;while(i<H.minSize&&t&&!e._lazysizesWidth){i=t.offsetWidth;t=t.parentNode}return i},ee=function(){var i,a;var t=[];var r=[];var n=t;var s=function(){var e=n;n=t.length?r:t;i=true;a=false;while(e.length){e.shift()()}i=false};var e=function(e,t){if(i&&!t){e.apply(this,arguments)}else{n.push(e);if(!a){a=true;(D.hidden?I:U)(s)}}};e._lsFlush=s;return e}(),te=function(i,e){return e?function(){ee(i)}:function(){var e=this;var t=arguments;ee(function(){i.apply(e,t)})}},ie=function(e){var i;var a=0;var r=H.throttleDelay;var n=H.ricTimeout;var t=function(){i=false;a=f.now();e()};var s=l&&n>49?function(){l(t,{timeout:n});if(n!==H.ricTimeout){n=H.ricTimeout}}:te(function(){I(t)},true);return function(e){var t;if(e=e===true){n=33}if(i){return}i=true;t=r-(f.now()-a);if(t<0){t=0}if(e||t<9){s()}else{I(s,t)}}},ae=function(e){var t,i;var a=99;var r=function(){t=null;e()};var n=function(){var e=f.now()-i;if(e<a){I(n,a-e)}else{(l||r)(r)}};return function(){i=f.now();if(!t){t=I(n,a)}}},e=function(){var v,m,c,h,e;var y,z,g,p,C,b,A;var n=/^img$/i;var d=/^iframe$/i;var E="onscroll"in u&&!/(gle|ing)bot/.test(navigator.userAgent);var _=0;var w=0;var N=0;var M=-1;var x=function(e){N--;if(!e||N<0||!e.target){N=0}};var W=function(e){if(A==null){A=Z(D.body,"visibility")=="hidden"}return A||!(Z(e.parentNode,"visibility")=="hidden"&&Z(e,"visibility")=="hidden")};var S=function(e,t){var i;var a=e;var r=W(e);g-=t;b+=t;p-=t;C+=t;while(r&&(a=a.offsetParent)&&a!=D.body&&a!=O){r=(Z(a,"opacity")||1)>0;if(r&&Z(a,"overflow")!="visible"){i=a.getBoundingClientRect();r=C>i.left&&p<i.right&&b>i.top-1&&g<i.bottom+1}}return r};var t=function(){var e,t,i,a,r,n,s,l,o,u,f,c;var d=k.elements;if((h=H.loadMode)&&N<8&&(e=d.length)){t=0;M++;for(;t<e;t++){if(!d[t]||d[t]._lazyRace){continue}if(!E||k.prematureUnveil&&k.prematureUnveil(d[t])){R(d[t]);continue}if(!(l=d[t][$]("data-expand"))||!(n=l*1)){n=w}if(!u){u=!H.expand||H.expand<1?O.clientHeight>500&&O.clientWidth>500?500:370:H.expand;k._defEx=u;f=u*H.expFactor;c=H.hFac;A=null;if(w<f&&N<1&&M>2&&h>2&&!D.hidden){w=f;M=0}else if(h>1&&M>1&&N<6){w=u}else{w=_}}if(o!==n){y=innerWidth+n*c;z=innerHeight+n;s=n*-1;o=n}i=d[t].getBoundingClientRect();if((b=i.bottom)>=s&&(g=i.top)<=z&&(C=i.right)>=s*c&&(p=i.left)<=y&&(b||C||p||g)&&(H.loadHidden||W(d[t]))&&(m&&N<3&&!l&&(h<3||M<4)||S(d[t],n))){R(d[t]);r=true;if(N>9){break}}else if(!r&&m&&!a&&N<4&&M<4&&h>2&&(v[0]||H.preloadAfterLoad)&&(v[0]||!l&&(b||C||p||g||d[t][$](H.sizesAttr)!="auto"))){a=v[0]||d[t]}}if(a&&!r){R(a)}}};var i=ie(t);var B=function(e){var t=e.target;if(t._lazyCache){delete t._lazyCache;return}x(e);K(t,H.loadedClass);Q(t,H.loadingClass);V(t,L);X(t,"lazyloaded")};var a=te(B);var L=function(e){a({target:e.target})};var T=function(t,i){try{t.contentWindow.location.replace(i)}catch(e){t.src=i}};var F=function(e){var t;var i=e[$](H.srcsetAttr);if(t=H.customMedia[e[$]("data-media")||e[$]("media")]){e.setAttribute("media",t)}if(i){e.setAttribute("srcset",i)}};var s=te(function(t,e,i,a,r){var n,s,l,o,u,f;if(!(u=X(t,"lazybeforeunveil",e)).defaultPrevented){if(a){if(i){K(t,H.autosizesClass)}else{t.setAttribute("sizes",a)}}s=t[$](H.srcsetAttr);n=t[$](H.srcAttr);if(r){l=t.parentNode;o=l&&j.test(l.nodeName||"")}f=e.firesLoad||"src"in t&&(s||n||o);u={target:t};K(t,H.loadingClass);if(f){clearTimeout(c);c=I(x,2500);V(t,L,true)}if(o){G.call(l.getElementsByTagName("source"),F)}if(s){t.setAttribute("srcset",s)}else if(n&&!o){if(d.test(t.nodeName)){T(t,n)}else{t.src=n}}if(r&&(s||o)){Y(t,{src:n})}}if(t._lazyRace){delete t._lazyRace}Q(t,H.lazyClass);ee(function(){var e=t.complete&&t.naturalWidth>1;if(!f||e){if(e){K(t,"ls-is-cached")}B(u);t._lazyCache=true;I(function(){if("_lazyCache"in t){delete t._lazyCache}},9)}if(t.loading=="lazy"){N--}},true)});var R=function(e){if(e._lazyRace){return}var t;var i=n.test(e.nodeName);var a=i&&(e[$](H.sizesAttr)||e[$]("sizes"));var r=a=="auto";if((r||!m)&&i&&(e[$]("src")||e.srcset)&&!e.complete&&!J(e,H.errorClass)&&J(e,H.lazyClass)){return}t=X(e,"lazyunveilread").detail;if(r){re.updateElem(e,true,e.offsetWidth)}e._lazyRace=true;N++;s(e,t,r,a,i)};var r=ae(function(){H.loadMode=3;i()});var l=function(){if(H.loadMode==3){H.loadMode=2}r()};var o=function(){if(m){return}if(f.now()-e<999){I(o,999);return}m=true;H.loadMode=3;i();q("scroll",l,true)};return{_:function(){e=f.now();k.elements=D.getElementsByClassName(H.lazyClass);v=D.getElementsByClassName(H.lazyClass+" "+H.preloadClass);q("scroll",i,true);q("resize",i,true);q("pageshow",function(e){if(e.persisted){var t=D.querySelectorAll("."+H.loadingClass);if(t.length&&t.forEach){U(function(){t.forEach(function(e){if(e.complete){R(e)}})})}}});if(u.MutationObserver){new MutationObserver(i).observe(O,{childList:true,subtree:true,attributes:true})}else{O[P]("DOMNodeInserted",i,true);O[P]("DOMAttrModified",i,true);setInterval(i,999)}q("hashchange",i,true);["focus","mouseover","click","load","transitionend","animationend"].forEach(function(e){D[P](e,i,true)});if(/d$|^c/.test(D.readyState)){o()}else{q("load",o);D[P]("DOMContentLoaded",i);I(o,2e4)}if(k.elements.length){t();ee._lsFlush()}else{i()}},checkElems:i,unveil:R,_aLSL:l}}(),re=function(){var i;var n=te(function(e,t,i,a){var r,n,s;e._lazysizesWidth=a;a+="px";e.setAttribute("sizes",a);if(j.test(t.nodeName||"")){r=t.getElementsByTagName("source");for(n=0,s=r.length;n<s;n++){r[n].setAttribute("sizes",a)}}if(!i.detail.dataAttr){Y(e,i.detail)}});var a=function(e,t,i){var a;var r=e.parentNode;if(r){i=s(e,r,i);a=X(e,"lazybeforesizes",{width:i,dataAttr:!!t});if(!a.defaultPrevented){i=a.detail.width;if(i&&i!==e._lazysizesWidth){n(e,r,a,i)}}}};var e=function(){var e;var t=i.length;if(t){e=0;for(;e<t;e++){a(i[e])}}};var t=ae(e);return{_:function(){i=D.getElementsByClassName(H.autosizesClass);q("resize",t)},checkElems:t,updateElem:a}}(),t=function(){if(!t.i&&D.getElementsByClassName){t.i=true;re._();e._()}};return I(function(){H.init&&t()}),k={cfg:H,autoSizer:re,loader:e,init:t,uP:Y,aC:K,rC:Q,hC:J,fire:X,gW:s,rAF:ee}}(e,e.document,Date);e.lazySizes=t,"object"==typeof module&&module.exports&&(module.exports=t)}("undefined"!=typeof window?window:{});
                    //]]>
                    </script>

Then click on Save theme button for checkpoint.

LazySizes on Images


Next to apply it please search for everything imgin the theme.

<img...

Examples like this

<img src='//www.blogger.com/img/icon_delete13.gif'/>

Add class='lazyload'it to the markup like this

<img class='lazyload' src='//www.blogger.com/img/icon_delete13.gif'/>

Do the above for all img markup on the theme. What if the img markup already contains a class? Then you just need to add it lazyloadafter the first class, for example

<img class='blogger lazyload' src='//www.blogger.com/img/icon_delete13.gif'/>

When you're done, click the Save theme button . To apply it to the image in the post, you need to add it manually. For example this image link

<img alt="Kezel Responsive Blogger Template" style="border: none;" data-original-height="853" data-original-width="1494" height="365" src="https://2.bp.blogspot.com/-kMGbBcOW9CQ/XmcaaMSxhhI/AAAAAAAAJEA/wd8qaIWIBC4_Hm-IwK5kN_eZPSqsRFjSQCLcBGAsYHQ/s640/Kezel%2BResponsive%2BBlogger%2BTemplate.png" title="Kezel Responsive Blogger Template" width="640" />

Add class="lazyload"after imgon the markup

<img class="lazyload" alt="Kezel Responsive Blogger Template" style="border: none;" data-original-height="853" data-original-width="1494" height="365" src="https://2.bp.blogspot.com/-kMGbBcOW9CQ/XmcaaMSxhhI/AAAAAAAAJEA/wd8qaIWIBC4_Hm-IwK5kN_eZPSqsRFjSQCLcBGAsYHQ/s640/Kezel%2BResponsive%2BBlogger%2BTemplate.png" title="Kezel Responsive Blogger Template" width="640" />



Actually, for a better implementation, it's a good idea to replace srcthe image with a friend, data-srcbut for the new version of Blogger, it turns out that this hasn't worked well


LazySizes pada Video


Next apply to the video iFrame. It's the same as in the picture, in the video iFrame to add it here I give an example on this Youtube video iFrame

<iframe width="560" height="315" src="https://www.youtube.com/embed/Yjf_wc1zEfA" frameborder="0" allow="accelerometer; autoplay; encrypted-media; gyroscope; picture-in-picture" allowfullscreen></iframe>

Add class="lazyload"after the iframe and replace src withdata-src

<iframe class="lazyload" width="560" height="315" data-src="https://www.youtube.com/embed/Yjf_wc1zEfA" frameborder="0" allow="accelerometer; autoplay; encrypted-media; gyroscope; picture-in-picture" allowfullscreen></iframe>

To see the results, please check your blog on PageSpeed ​​Insights or GTmetrix or other sites to see changes in blog speed.

That's How to Increase Blog Loading with LazySizes that MIUSM TECH can share this time. Hopefully useful and greetings.

Sourcehttps://github.com/aFarkas/lazysizes

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