Tweet by KentonVarda
January 8, 2026
TL;DR: This optimization makes it so that when a large HTTP response (or request) body is proxying through Workers, we use the Linux splice() syscall to move the bytes from socket to socket, so they never even enter userspace.
- Author
- KentonVarda
- Date
- January 8, 2026
- Canonical URL
- /tweets/2026-01-08-kentonvarda-1312951784-05