Deno.serv Brotli compression incredibly slow

[dkfdkdodkms]

I just started with Deno yesterday, and no disrespect intended, but I'm not particularly impressed given what I've encountered just a few hours in: 1.3k issues, some security related; unhelpful and/or incorrect documentation. APIs that have significant, easy to encounter bugs, or just appear incomplete, which brings me to Deno.serve (example):

const url = new URL(request.url);
let pathname = url.pathname.toLowerCase();
if (pathname.endsWith('/')) pathname += 'index.html';

const fileSize = await getFileSize(filePath);
if (!fileSize) return new Response("404 Not Found", {status:404});
                
const file = await Deno.open(filePath, { read: true });
const body = file.readable;

const responseInit:ResponseInit = 
{
     headers: 
     {
         "content-length":fileSize.toString(),
          "content-type":media_types.contentType(path.extname(filePath)) || 'application/octet-stream',
     }
}

The above code using Deno.serve (just marked as stable mind you) takes about 5 seconds to load a 1.8mb js file using Google Chrome, and a few milliseconds with Safari. The difference? Safari is only accepting gzip compression while Chrome is accepting Brotli.

Anyway, while I realize this is community driven, it would be great if resolving issues (actual bugs) could be made a higher priority than new features. New users should probably not be encountering, nor having to debug, standard functionality like this right out of the gate. I experienced the same issue with CloudFlare; their code is about as alpha as it gets, which I find inexcusable given their position. Don't follow in their footsteps is all I'm asking.

[porridgewithraisins]

Minimum reproduceable example:

cat /dev/urandom | tr -dc A-Za-z0-9 | head -c 2M > words

//main.ts
Deno.serve(
    async () => {
        const file = await Deno.open("words", { read: true });
        return new Response(file.readable, {
            headers: {
                "Content-Type": "text/plain", //required to activate compression in Deno.serve
            },
        });
    },
    { port: 8000 }
);

deno run --allow-read --allow-net main.ts
time curl -v -H "Accept-Encoding: gzip" localhost:8000 > /dev/null # takes few milliseconds
time curl -v -H "Accept-Encoding: br" localhost:8000 > /dev/null # takes few seconds