Dgraph's writes are actually very fast. The one-time bulk loader loads at millions of records per second. With recent optimizations [1], the live loader can load 21M records in 5 mins without indices and 20 mins with tons of indices. Note that all live data load also does WAL, consensus and disk syncs before every write call finishes to ensure crash-resilience.

[1]: https://github.com/dgraph-io/dgraph/commit/d697ca0898f0ac951...