Optimize your graphics. Make SWF file banner advertisements 15K or smaller.
Create a GIF banner advertisement in Flash that is 12K or smaller.
Limit looping banner advertisements to three repetitions. Many websites adopt the standardized file size recommendations as advertising specifications.
Use the GET command to pass data between an advertisement and a server, and do not use the POST command. For more information on GET and POST, see the getURL function in ActionScript 2.0 Language Reference.