deno: Slow upload speed for http server

I tested upload speed for varius file sizes: 10M, 100M, 1000M in comparison of node.js upload speed in Deno is about 2x-3x slower and on 1G file deno is 10x slower and use almost all CPU resources (my ubuntu 20.04 vps server has 2 cpu cores and 2G ram). What I’m doing wrong or how to improve upload speed??

Send test data to server(localhost) via curl:

time curl -H "Content-Type:application/octet-stream" --data-binary @/dir/dev/foo1000M.bin  http://127.0.0.1:8080/upload/foo.bin

Test file for uploading was created by command:

truncate -s 10M foo10M.bin

import { serve } from "https://deno.land/std@0.125.0/http/server.ts";
import { config } from "./modules/config.js"
import * as path from "https://deno.land/std/path/mod.ts"
import {
    writableStreamFromWriter,
    readableStreamFromReader,
} from "https://deno.land/std/streams/mod.ts";

const PORT=8080

async function handler(req){
    console.log(`>>>new request: ${req.method}, ${req.url}, path: ${req.pathname} params: ${req.searchParams}`)
    console.log("HEADERS:",req.headers)

    if (req.body) {
        console.log("==>hasBody!");
        const file = await Deno.open(path.join(config.upload_dir, "native_deno.bin"), { create: true, write: true })
        const writableStream = writableStreamFromWriter(file)
        await req.body.pipeTo(writableStream)
    }
    console.log(">>upload complete!")
    return new Response("upload complete!");
}

serve(handler, { port: PORT })
console.log(">>>server listen...",PORT)

Results:

for 10M file:
   Deno:  60 - 90ms      Node:  35-40ms

for 100M file:
    Deno:  500-600ms   Node:  260ms

for 1000M file:
    Deno:  20s-5m          Node: 1000-1700ms

I repeat upload test multiple times and every time on 1G file deno server become slower and slower (for 10M and 100M test file I don’t see any performance reduction) but node server upload time stay the same avery time.