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Sun, Nov 1 2009 16:41

Simple way to cache objects and collections for greater performance and scalability

Caching of frequently used data greatly increases the scalability of your application since you can avoid repeated queries on database, file system or to webservices. When objects are cached, it can be retrieved from the cache which is lot faster and...
Posted by omar | 6 comment(s)
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Fri, Sep 25 2009 15:46

7 tips for for loading Javascript rich Web 2.0-like sites significantly faster

Introduction When you create rich Ajax application, you use external JavaScript frameworks and you have your own homemade code that drives your application. The problem with well known JavaScript framework is, they offer rich set of features which are...
Posted by omar | 9 comment(s)
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Sat, Mar 14 2009 9:35

Memory Leak with delegates and workflow foundation

Recently after Load Testing my open source project Dropthings , I encountered a lot of memory leak. I found lots of Workflow Instances and Linq Entities were left in memory and never collected. After profiling the web application using .NET Memory Profiler...
Posted by omar | 1 comment(s)
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Fri, Mar 13 2009 14:23

Optimize ASP.NET Membership Stored Procedures for greater speed and scalability

Last year at Pageflakes , when we were getting millions of hits per day, we were having query timeout due to lock timeout and Transaction Deadlock errors. These locks were produced from aspnet_Users and aspnet_Membership tables. Since both of these tables...
Posted by omar | 8 comment(s)
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Sat, Mar 7 2009 7:30

Linq to SQL solve Transaction deadlock and Query timeout problem using uncommitted reads

When your database tables start accumulating thousands of rows and many users start working on the same table concurrently, SELECT queries on the tables start producing lock contentions and transaction deadlocks. This is a common problem in any high volume...
Posted by omar | 11 comment(s)
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Wed, Dec 10 2008 8:39

99.99% available ASP.NET and SQL Server SaaS Production Architecture

You have a hot ASP.NET+SQL Server product, growing at thousand users per day and you have hit the limit of your own garage hosting capability. Now that you have enough VC money in your pocket, you are planning to go out and host on some real hosting facility...
Posted by omar | 4 comment(s)
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Thu, Oct 30 2008 1:27

Linq to SQL: Delete an entity using Primary Key only

Linq to Sql does not come with a function like .Delete(ID) which allows you to delete an entity using it’s primary key. You have to first get the object that you want to delete and then call .DeleteOnSubmit(obj) to queue it for delete. Then you...
Posted by omar | 18 comment(s)
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Mon, Oct 27 2008 14:31

Solving common problems with Compiled Queries in Linq to Sql for high demand ASP.NET websites

If you are using Linq to SQL, instead of writing regular Linq Queries, you should be using Compiled Queries . if you are building an ASP.NET web application that’s going to get thousands of hits per hour, the execution overhead of Linq queries is...
Posted by omar | 16 comment(s)
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Sun, Oct 5 2008 11:29

Using multiple broadband connections without using any special router or software

I have two broadband connections. One cheap connection, which I mostly use for browsing and downloading. Another very expensive connection that I use for voice chat, remote desktop connection etc. Now, using these two connections at the same time required...
Posted by omar | 9 comment(s)
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Sat, Oct 4 2008 11:05

Best practices for creating websites in IIS 6.0

Every time I create an IIS website, I do some steps, which I consider as best practice for creating any IIS website for better performance, maintainability, and scalability. Here' re the things I do: Create a separate application pool for each web...
Posted by omar | 20 comment(s)
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Thu, Aug 28 2008 19:43

HTTP handler to combine multiple files, cache and deliver compressed output for faster page load

It's a good practice to use many small Javascript and CSS files instead of one large Javascript/CSS file for better code maintainability, but bad in terms of website performance. Although you should write your Javascript code in small files and break...
Posted by omar | 26 comment(s)
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Fri, Aug 1 2008 19:15

Loading static content in ASP.NET pages from different domain for faster parallel download

Generally we put static content (images, css, js) of our website inside the same web project. Thus they get downloaded from the same domain like www.dropthings.com . There are three problems in this approach: They occupy connections on the same domain...
Posted by omar | 25 comment(s)
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Mon, Jun 30 2008 9:12

Deploy ASP.NET MVC on IIS 6, solve 404, compression and performance problems

There are several problems with ASP.NET MVC application when deployed on IIS 6.0: Extensionless URLs give 404 unless some URL Rewrite module is used or wildcard mapping is enabled IIS 6.0 built-in compression does not work for dynamic requests. As a result...
Posted by omar | 21 comment(s)
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Mon, Jun 9 2008 7:08

ensure - Ensure relevant Javascript and HTML are loaded before using them

ensure allows you to load Javascript, HTML and CSS on-demand, whenever they are needed. It saves you from writing a gigantic Javascript framework up front so that you can ensure all functions are available whenever they are needed. It also saves you from...
Posted by omar | 1 comment(s)
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Sat, May 10 2008 1:31

Fast ASP.NET web page loading by downloading multiple javascripts in batch

A web page can load a lot faster and feel faster if the javascripts on the page can be loaded after the visible content has been loaded and multiple javascripts can be batched into one download. Browsers download one external script at a time and sometimes...
Posted by omar | 23 comment(s)
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Mon, Apr 14 2008 8:29

Fast, Streaming AJAX proxy - continuously download from cross domain

Due to browser's prohibition on cross domain XMLHTTP call, all AJAX websites must have server side proxy to fetch content from external domain like Flickr or Digg. From client side javascript code, an XMLHTTP call goes to the server side proxy hosted...
Posted by omar | 15 comment(s)
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Mon, Apr 7 2008 14:17

Reduce website download time by heavily compressing PNG and JPEG

PNG and JPEG are two most popular formats for web graphics. JPEG is used for photographs, screenshots and backgrounds where PNG is used for all other graphics need including cliparts, buttons, headers, footers, borders and so on. As a result, these two...
Posted by omar | 9 comment(s)
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Sun, Apr 6 2008 15:49

Fast page loading by moving ASP.NET AJAX scripts after visible content

ASP.NET ScriptManager control has a property LoadScriptsBeforeUI , when set to false , should load all AJAX framework scripts after the content of the page. But it does not effectively push down all scripts after the content. Some framework scripts, extender...
Posted by omar | 21 comment(s)
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Wed, Jan 30 2008 15:47

10 ASP.NET Performance and Scalability Secrets

ASP.NET 2.0 has many secrets, when revealed, can give you big performance and scalability boost. For instance, there are secret bottlenecks in Membership and Profile provider which can be solved easily to make authentication and authorization faster....
Posted by omar | 3 comment(s)
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Thu, Nov 29 2007 16:21

Making best use of cache for high performance website

Use URLs consistently Browsers cache content based on the URL. When URL changes, browser fetches a new version from origin server. URL can be changed by changing the query string parameters. For example, “/default.aspx” is cached on the browser. If you...
Posted by omar | 6 comment(s)
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