{"id":258,"date":"2011-05-24T05:13:17","date_gmt":"2011-05-24T05:13:17","guid":{"rendered":"https:\/\/blog.alwawee.ru\/?p=258"},"modified":"2011-07-06T13:13:15","modified_gmt":"2011-07-06T13:13:15","slug":"how-to-speed-up-web-page-loading","status":"publish","type":"post","link":"https:\/\/blog.alwawee.ru\/?p=258","title":{"rendered":"How to speed up web page loading"},"content":{"rendered":"

There are some tips and tricks<\/strong>, that I discovered while creating our web page:<\/p>\n

    \n
  1. It is better not to use cookies<\/strong>, if possible. And better use less Javascript<\/strong>. I used cookies in the following code to save a number of the current image. Then I took this number and tried to load a fresh image when user enters to the cite after a while.
    \n————————————————————————————–
    \n
    \nvar currentN=0;
    \ncurrentN = get_cookie(\"currentN\");
    \n\/\/alert(\"Read currentN = \" + currentN.toString()); <\/code> <\/p>\n

    function changecenterimg(img_name)
    \n{
    \nvar N = getRandomArbitary(1, 4);
    \nN = Number(currentN) + Number(1);<\/code><\/p>\n

    while(N == currentN)
    \n{
    \nN = getRandomArbitary(1, 4);
    \n}<\/code><\/p>\n

    if (N != currentN)
    \n{
    \ncurrentN = N;
    \nvar img_src = 'images\/c'+ N.toString() + '.jpg';
    \ndocument[img_name].src=img_src;
    \n}
    \nset_cookie(\"currentN\", currentN);
    \n\/\/alert(\"Set currentN = \" + currentN.toString());
    \n}<\/code><\/p>\n

    function init()
    \n{
    \n\/\/alert(\"init started\");
    \nchangecenterimg('centerimg');
    \n}<\/code><\/p>\n

    function set_cookie ( cookie_name, cookie_value )
    \n{
    \ndocument.cookie = \"currentN=\" + currentN.toString();
    \n}<\/code><\/p>\n

    <\/code> function get_cookie ( cookie_name )
    \n{
    \nvar cookie_string = document.cookie ;
    \nif (cookie_string.length != 0) {
    \nvar cookie_value = cookie_string.match (
    \n'(^|;)[\\s]*' +
    \ncookie_name +
    \n'=([^;]*)' );
    \nreturn decodeURIComponent ( cookie_value[2] ) ;
    \n}<\/code>
    \n————————————————————————————–<\/p>\n

    And I understood after some time, that this code was seriously lowering web page loading. After this I tried to change center image loading process to the following:<\/p>\n

    ————————————————————————————–
    \n
    \nfunction changecenterimg(img_name)
    \n{
    \nN = Number(currentN) + Number(1);
    \nif (N > 4)
    \n{
    \nN = 1;
    \n}
    \ncurrentN = N;
    \nvar img_src = 'images\/c'+ N.toString() + '.jpg';
    \ndocument[img_name].src=img_src;
    \n}<\/code>
    \n————————————————————————————–<\/p>\n

    Less Javascript we have – faster the page loads. Also I removed infinite cycle in generating new random image number. Although this cycle didn’t work more than two times. It’s noteworthy that in Javascript to make a sum of two numbers we should write:<\/p>\n

    ————————————————————————————–
    \n
    \nN = Number(currentN) + Number(1);<\/code>
    \n————————————————————————————–<\/p>\n

    Because if we write just<\/p>\n

    ————————————————————————————–
    \n
    \nN = currentN + 1;<\/code>
    \n————————————————————————————–<\/p>\n

    we will get concatenation of strings, so that for example N will become 11 after 1+1.\n<\/li>\n

    <\/br><\/p>\n

  2. Images can be optimized <\/strong>to be smaller in size and unfortunately in quality. The following link was very useful for this purpose: http:\/\/tools.dynamicdrive.com\/imageoptimizer\/index.php<\/a> I managed to make my images more than two times smaller from 24 kbyte to 10 kbyte<\/li>\n

    <\/br><\/p>\n

  3. Try to avoid reloading whole page<\/strong> and try to reload or change only some elements. For example, I was reloading page to refresh image after user clicks on it:\n

    ————————————————————————————–
    \n<div id=\"center-column\"> <\/code> <\/p>\n

    <a href=\"index.html\"><\/code><\/p>\n

    <img src=\"#\" alt=\"Image\" width=\"350\" height=\"250\" \/><\/code><\/p>\n

    <\/a><\/code><\/p>\n

    <\/div><\/p>\n

    <\/code>————————————————————————————–<\/p>\n

    I changed this to the following to reload only one image:<\/p>\n

    ————————————————————————————–
    \n <div id=\"center-column\"><\/code><\/p>\n

    <a href=\"javascript:changecenterimg('centerimg');\"><\/code><\/p>\n

    <img name=\"centerimg\" src=\"#\" alt=\"Image\" width=\"350\" height=\"250\"><\/code><\/p>\n

    <\/a><\/code><\/p>\n

    <\/code><\/div><\/code>
    \n————————————————————————————–<\/li>\n<\/ol>\n","protected":false},"excerpt":{"rendered":"

    There are some tips and tricks, that I discovered while creating our web page: It is better not to use cookies, if possible. And better use less Javascript. I used cookies in the following code to save a number of the current image. Then I took this number and tried to load a fresh image […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[35],"tags":[],"class_list":["post-258","post","type-post","status-publish","format-standard","hentry","category-android"],"yoast_head":"\nHow to speed up web page loading - Denis Kutlubaev<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/blog.alwawee.ru\/?p=258\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"How to speed up web page loading - Denis Kutlubaev\" \/>\n<meta property=\"og:description\" content=\"There are some tips and tricks, that I discovered while creating our web page: It is better not to use cookies, if possible. 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