. . . consider the case of an ASP page containing two HTML frames: frames 1 and 2, both within one frameset. Frame 1 contains an .asp file that executes a complex script, while frame 2 contains a simpler .asp file. Because ASP executes session requests in sequential order, or serially, you will not be able to see the contents of frame 2 until the script in frame 1 has executed. However, if you make the .asp file for frame 1 sessionless, then ASP requests will no longer be serialized and the browser will render the contents of frame 2 before the contents of frame 1 have finished executing.
Unfortunately, the way in which multiple requests for different frames are processed ultimately depends on the configuration of the user's Web browser. Certain Web browsers may serialize requests despite the sessionless configuration of your .asp files.