huge performance gap with nodejs and postgresql benchmark - node.js

Question

I am creating an application with nodejs, it is using Hapi for web framework and knex for sql builder, The primary code is following:
server.route({
method: 'POST',
path: '/location',
config: {
tags: ['api'],
validate: {
payload: {
longitude: Joi.string().regex(/^\d+\.\d+$/).required(),
latitude: Joi.string().regex(/^\d+\.\d+$/).required(),
date: Joi.string().regex(/^\d{4}-\d{1,2}-\d{1,2}\s\d{1,2}:\d{1,2}.+$/).required(),
phone: Joi.string().required(/^1\d{10}$/)
}
}
},
handler: createLocation
})
async function createLocation(request, reply){
try{
const data = await knex('locations').insert(request.payload)
reply(data)
}catch(error){
reply(error)
}
}
It simply insert some date to postgresql. I am using Wrk to benchmark it Concurrent throughput in Google Compute Engine(cheapest machine), Result:
$ wrk -c 100 -t 12 http://localhost/api/location -s wrk.lua
Running 10s test # http://panpan.tuols.com/api/location
12 threads and 100 connections
Thread Stats Avg Stdev Max +/- Stdev
Latency 542.22ms 102.93ms 1.02s 88.32%
Req/Sec 21.95 18.74 70.00 78.71%
1730 requests in 10.02s, 0.94MB read
Requests/sec: 172.65
Transfer/sec: 96.44KB
Then I using pgbench to test postgresql insert performance:
$ pgbench location -U postgres -h localhost -r -t 1000 -f index.sql -c 10
transaction type: index.sql
scaling factor: 1
query mode: simple
number of clients: 10
number of threads: 1
number of transactions per client: 1000
number of transactions actually processed: 10000/10000
latency average = 1.663 ms
tps = 6014.610692 (including connections establishing)
tps = 6029.973067 (excluding connections establishing)
script statistics:
- statement latencies in milliseconds:
1.595 INSERT INTO "public"."locations"("phone", "longitude", "latitude", "date", "createdAt", "updatedAt") VALUES('18382383428', '123,33', '123.33', 'now()', 'now()', 'now()') RETURNING "id", "phone", "longitude", "latitude", "date", "createdAt", "updatedAt";
The nodejs is 172.65 req/s, and the postgresql internal native is 6000 req/s, The are actually do some thing, if ignore the http overhead, the difference should not so much big, Why the performance is so much hug different? It is nodejs or node-pg package problem?