TL;DR: Go's built-in encoding/csv. Read() allocates string slices and strings for every single row, generating 10M+ allocations and burning 540 MB on a 5M-row file. I built go-zerocsv to replace this with in-place typed scanning ( Record.
Source: [Dev.to](https://dev.to/fikrimohammad/why-gos-encodingcsv-burns-540mb-on-5m-rows-and-how-i-fixed-it-4m63)