Hello Racketeers,

With Racket 7.1 on macOS, the following snippet takes some time to run:

```
#lang racket
(require net/url)
(require net/url-string)
(get-pure-port/headers (string->url "https://video.blender.org";))
```

```shell
time racket plop.rkt
#<input-port:pipe>
"Access-Control-Allow-Origin: *\r\nContent-Length: 13080\r\nContent-Type: text/html; charset=utf-8\r\nDate: Thu, 24 Jan 2019 22:03:48 GMT\r\nEtag: W/\"3318-iMh3Y+6f+0qSo/4RXYkvd/3uy68\"\r\nTk: N\r\nX-Content-Type-Options: nosniff\r\nX-Dns-Prefetch-Control: off\r\nX-Download-Options: noopen\r\nX-Frame-Options: DENY\r\nX-Xss-Protection: 1; mode=block\r\n\r\n"
       76.40 real         0.43 user         0.11 sys
```

The same request with `curl` takes around 3ms server side and less than 1s term time.

What’s the right way to investigate this issue?

Thanks for your time,
—
P.

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