Managed to score an A in YSlow‘s Performance tab. This takes into account the treating of Flickr, LinkedIn, W3C and thyncology.com as CDNs.
The first makes sense as I’ll be serving up images from there for some time at this point. The second is a temporary concession; I need to make a local copy of the link image eventually and stop retrieving images from there, and the third is more interesting.
Another topic discussed in High Performance Web Sites is the maximum # of parallel downloads per domain. By the HTTP 1.1 standard this is 2. Browsers can choose to ignore this but by default they obey like Andre. However, a way around the 2 simultaneous download limit (without resorting to a true CDN) is accomplished through mirroring. The browser believes the source files (in this case a few scripts and a .swf) to have come from another site, though the files are located in the same structure. Brilliant, and as cheap a solution as any that can potentially double my # of downloaded components at a time.
Grade attained, I can finally sleep. Well. Soon.