Google AppEngine Numbers This group of numbers is from Brett Slatkin in Building Scalable Web Apps with Google App Engine. Writes are expensive! Datastore is transactional: writes require disk access Disk access means disk seeks Rule of thumb: 10ms for a disk seek Simple math: 1s / 10ms = 100 seeks/sec maximum Depends on: * The size and shape of your data * Doing work in batches (batch puts and ge