Optional prefetching support
This reduces latency overhead during execution of build commands with network storage. This comes at the cost of increased startup time, however, with a sufficiently large local CAS cache this is expected to speed up the overall build process, especially in environments where the same few base systems / SDKs are used for most build jobs.
The plan is to use the batch download API for smaller files and to implement this in the main BuildBox process. This will also require batch API support in the CAS server.