Deploy nodejs server on reverse proxy nginx is slow

[SudoDios]

I create a nodejs http server and using autocannon to loadtest.
When I use this node server without a nginx proxy, the requests reach 137k per second.
But when I use it with nginx reverse proxy, it reaches 60k per second.
Why ????
please help me.🙏

[jarebear6expepjozn6rakjq5iczi3irqwphcvb]

Can you post config for the reverse proxy?

[SudoDios]

user www-data;
worker_processes auto;
worker_rlimit_nofile 900000;
pid /run/nginx.pid;
include /etc/nginx/modules-enabled/*.conf;

events {
	worker_connections 400000;
	use epoll;
        multi_accept on;
}

http {

	##
	# Basic Settings
	##

	sendfile on;
	tcp_nopush on;
	tcp_nodelay on;
	keepalive_timeout 10;
	#types_hash_max_size 2048;
	# server_tokens off;

	# server_names_hash_bucket_size 64;
	# server_name_in_redirect off;

	include /etc/nginx/mime.types;
	default_type application/octet-stream;

	##
	# SSL Settings
	##

	ssl_protocols TLSv1 TLSv1.1 TLSv1.2 TLSv1.3; # Dropping SSLv3, ref: POODLE
	ssl_prefer_server_ciphers on;

	##
	# Logging Settings
	##

	access_log /var/log/nginx/access.log;
	error_log /var/log/nginx/error.log;

	##
	# Gzip Settings
	##
	
	gzip on;
        gzip_min_length 10240;
        gzip_comp_level 1;
        gzip_vary on;
        gzip_disable msie6;
        gzip_proxied expired no-cache no-store private auth;


	##
	# Virtual Host Configs
	##

	include /etc/nginx/conf.d/*.conf;
	include /etc/nginx/sites-enabled/*;

	access_log off;
	
	auth_basic "Auth ...";
        auth_basic_user_file /etc/nginx/.htpasswd;
        
	
        server {
	   listen myIP:80;
	   
	   client_max_body_size 1g;
	  
	   location / {
	      root /home/sudodios/banoo;
	   }
	   location /api/ {
		proxy_pass http://localhost:2000/;
	   }
	}
}

http://localhost:2000/ is my node server.

[aminvakil]

@SudoDios
You may have reached the kernel security limits and nginx -t may give you a hint about it, or you may have reached max tcp connections, can nodejs listen on unix sockets?