A year ago I did some benchmarks and found that from_reader is much slower than from_slice. There's now a note in the serde_json docs, so it still seems to be a

A year ago I did some benchmarks and found that from_reader is much slower than from_slice. There's now a note in the serde_json docs, so it still seems to be an issue. I guess std::fs::read + serde_json::from_slice is the fastest way to do it, because it avoids the from_reader slowness and an UTF-8 validation.