Internet Explorer browsers can only download two files from the same domain at the same time.

Internet Explorer browsers can only download two files from the same domain at the same time.
For reasons please see MSDN Blogs: Internet Explorer and Connection Limits, how to remove restrictions see Microsoft Customer Help and Support home page: How to connect Internet Explorer Configured to allow more than two download sessions at a time.
No matter how hot Firefox is, there is no denying that IE is still the boss of the browser market. Therefore, in the system architecture, you have to consider IE can only download from the same domain name two files limit. If there are more than two files, IE will wait for two files to be downloaded in a queue, then download the next two files. This way, when multiple images are displayed on a single page, the download speed of IE users ' pictures will be affected.
Baidu, Sina, Yahoo and other websites adopted the same set of image servers, using multiple two-level domain names to solve the problem.
Through the HttpWatch Professional 5.2.17 analysis can be seen, Baidu's image search using the t1.baidu.com ~ t8.baidu.com eight domain name to display pictures, consumption in IE browser side Blocked time less than 0.001 seconds, non- Always fast.
Sina's picture CDN also uses the i0.sinaimg.cn ~ i3.sinaimg.cn four domain name to display the picture, consumes in the IE browser side Blocked time is also 0.001 seconds. Sina uses the independent top-level domain name sinaimg.cn instead of the ***.sina.com.cn domain name as the picture server domain name, also has the benefit, is the Cookie information under the sina.com.cn domain not to be taken to the sinaimg.cn domain, enhances the picture server parsing The speed of the header head.

Look at NetEase album a group of picture server, only use pics.photo.163.com a domain name, consume in IE browser side of Blocked time for 0.647 seconds, it is relatively slow.

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