Device Fingerprinting is increasingly used by advertising companies. 1.5% of the top 10.000 sites have been tracking you. No cookies needed. As this raises privacy concerns, Marji Cermak presented this topic as a Drupal Sydney lightning talk.
A lightening talk which examines the entity load times for different objects including nodes, users, field collections and users. Comparisons are made between different caching strategies, including entitycache, as well as the weight added by fields and hooks. Just how heavy are nodes anyway?