As I've said previously [1][2][3], you shouldn't PUSH with `Link re="preload"` for performance gains. You will likely run into TCP HOL Blocking or browser request race conditions. Instead send PUSH_PROMISES in the whitespace while the client waits for the TTFB.

[1] https://news.ycombinator.com/item?id=14082636 [2] https://shouldipush.com [3] https://youtu.be/GjWD1pOkxUk?t=1534