CDN load balancing specialist Cedexis announced a partnership this week with Sweden’s Varnish Software, a pioneer in open sourced caching software. The idea is that Cedexis will be able to create a hybrid, using an instance of Varnish to fill in the performance holes in a CDN network. Essentially Varnish is an open source web accelerator or cache, with a few secret sauce extras in its paid-for product line, which improve performance further. A cache simply keeps regularly requested pages already made up as images, so there is no processing time taken in creating them. Varnish says that this approach can improve performance by up to 99%, and it has just begun to understand the effect this can have on…