I once tried a sed script on a couple million text files (60 GB in total) - they were web pages downloaded in some format (WARC? I don't remember what it was ca

I once tried a sed script on a couple million text files (60 GB in total) - they were web pages downloaded in some format (WARC? I don't remember what it was called) and I needed to change the formatting slightly (to feed them to Nutch) - Mac's default sed was literally 50 times slower than gsed (on the same machine). If I remember correctly, gsed finished the task in under two hours.