Performance: Server Resource Caching (or: don't reinvent the wheel)

Switched from caching resources using HttpApplicationState to System.Web.Caching.Cache. The previous "cache" mechanism effectively kept everything in memory, which made IIS/ASP.NET think there was a memory leak and recycle the app domain on a regular basis. The server should be much happier. In concrete terms, the map should generally be more responsive now. Ω