Asynchronous C# Method Calls In Page Working On Debug, But Not Working On Live Site

Jan 25, 2011

OK Here is the situation:

I have a web app with a table of statistics on our salesmen's customers, and each row has a sparkline graph showing the general trend of the sales data for the last 12 months. Each page shows a particular salesman's customer list, and some of them can have an enormous number of customers = an enormous number of rows = an enormous number of sparklines (e.g. one in particular has 125 and takes 15 seconds to load).

For this reason, jQuery sparklines could not be used - they completely pinned the CPU of a user accessing a page with a lot of sparklines with IE.

So I moved on to using the Google Chart API, which worked much better, except for two issues: 1) it's on a secure site, and the Google Chart API URL is only served over HTTP (solved by using a small wrapper script to download the graph dynamically and re-serve it from our secure server); and 2) on a page with 125 sparklines, it was still very slow due to the number of requests (even when the 0-9 server prefixes are used to maximize the # of available connections).

So my next step beyond this was to try to make each of the "download/grab/re-serve image" method calls asynchronous - and it worked!

...but only on my dev box running in debug mode.

When I pushed it up to the live site, it was faster, but it left some of the images unloaded, which is of course unacceptable.

So here is what I was hoping some SO hotshot would know:

1) Why are my asynchronous method calls working while debugging, but not working on the live site?

2) Is there any easier way to get a large number of sparklines of some sort to load quickly on a secure server without making me want to tear my hair out?

2a.) Does anyone have any experience using the ASP.NET Chart Library? Is this something I should investigate?

2b.) A co-worker suggested I make my own sparkline routine using a 1x1 CSS background image and varying the height. The problems are a) it is completely un-extensible in case we want to make changes; b) it seems hacky as hell (leaves about a bajillion DIVs per sparkline in the markup); and c) I have no idea if it will be fast enough when there are 100-200 of them on one page - what are your thoughts on the feasibility of the 1x1 sprite approach?

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