In my recent experience I have faced some performance issues one of them is web application becomes very much slow. To identify this problem I have searched over the net and I have found a lots of topics. Now I want to share some of the topics with you in summarized way: 1.Minimize HTTP Requests 2.Use a Content Delivery Network 3.Add an Expires or a Cache-Control Header 4.Gzip Components 5.Put Stylesheets at the Top 6.Put Scripts at the Bottom 7.Avoid CSS Expressions 8.Make JavaScript and CSS External 9.Reduce DNS Lookups 10.Minify JavaScript and CSS 11.Avoid Redirects 12.Remove Duplicate Scripts 13.Configure ETags 14.Make Ajax Cacheable 15.Flush the Buffer Early 16.Use GET for AJAX Requests 17.Post-load Components 18.Preload Components 19.Reduce the Number of DOM Elements 20.Split Components Across Domains 21.Minimize the Number of iframes 22.No 404s 23.Reduce Cookie Size 24.Use Cookie-free Domains for Components 25.Minimize DOM Access 26.Develop Smart Event Handlers 27.Avoid too much normalization 28.Avoid Filters 29.Optimize Images 30.Optimize CSS Sprites 31.Don't Scale Images in HTML 32.Make favicon.ico Small and Cacheable 33.Keep Components under 25K 34.Pack Components into a Multipart Document 35.Enable HTTP Keep-Alives 36.Adjust Connection Timeouts 37.Enable HTTP Compression
