We did not run benchmarks with chrome-headless-shell (aka the old headless mode)...

fbouvier on Jan 24, 2025 | parent | context | favorite | on: Show HN: Lightpanda, an open-source headless brows...

We did not run benchmarks with chrome-headless-shell (aka the old headless mode) but I guess that performance wise it's on the same scale as the new headless mode.