call aspx page to return an image randomly slow

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Because you use .aspx page (and not handler), and because the images loaded by browser not one by one, but many together, I suspect that you felt on the session lock of the page and that’s why this delay.

Try to set EnableSessionState="false" on the page.

eg: 

<%@ Page language="c#" Codebehind="WebForm1.aspx.cs" 
    AutoEventWireup="false" Inherits="WebApplication1.WebForm1" 
     EnableSessionState="false" %>

By the way, if you change the aspx page to a handler page you going to gain some more speed because the handler page did not make all the calls that a normally page do.

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