Processing data includes: receiving units of work that each include one or more work elements, and processing a first unit of work using a first compiled dataflow graph (160) loaded into a data processing system (100) in response to receiving the first unit of work. The processing includes: analysis to determine a characteristic of the first unit of work; identifying one or more compiled dataflow graphs from graphs stored in a data storage system (107) that include at least some that were compiled for processing a unit of work having the determined characteristic; loading one of the identified compiled dataflow graphs into the data processing system (100) as the first compiled dataflow graph (160); and generating one or more output work elements from at least one work element in the first unit of work.