next.config.js
keepAlive
Follow up to #27376 so users can disable keep-alive. See comment https://github.com/vercel/next.js/pull/27376#issuecomment-885415623
node-fetch
Fixes #27109 This PR adds a default `agent` as described in the [`node-fetch` docs](https://github.com/node-fetch/node-fetch#custom-agent). We should see about 2x perf according to some [benchmarks](https://github.com/Ethan-Arrowood/undici-fetch/blob/main/benchmarks.md#fetch).