Slow upload speed using Symfony2 - Nginx. 100 MB in 15 minutes - performance

Question

I have a form in Symfony 2.7 to upload videos between 100MB - 500 MB to my web. The upload speed is around 700 kbps so a 100MB video last more than 15 minutes to be uploaded. This is too much, users run out of my website! I’ve tried with Wetransfer and the same video last only 30 seconds to upload with an upload speed of 30Mbps. (wetransfer upload speed is more than 30 times higher!)
I have a digitalocean VPS, nginx, symfony2.7 application.
I have been reading a lot of Nginx configuration and testing diferents configs but the speed remain very low. I have done changes in php.ini, nginx.conf but I don't understand what is happening..
This is my vps speed:
~$ curl -s https://raw.githubusercontent.com/sivel/speedtest-cli/master/speedtest.py | python -
Retrieving speedtest.net configuration...
Testing from DigitalOcean (xxx.xxx.xxx.xxx)...
Retrieving speedtest.net server list...
Selecting best server based on ping...
Hosted by Citybridge (New York City, NY) [16.98 km]: 2.628 ms
Testing download speed................................................................................
Download: 380.93 Mbit/s
Testing upload speed....................................................................................................
Upload: 352.91 Mbit/s
Nginx.conf and sites-available/domain:
user www-data;
worker_processes auto;
pid /run/nginx.pid;
events {
worker_connections 1024;
}
http {
client_max_body_size 1000M;
client_body_buffer_size 32M;
proxy_buffer_size 32M;
proxy_buffers 16 8M;
client_header_buffer_size 16k;
large_client_header_buffers 8 16k;
sendfile on;
tcp_nopush on;
tcp_nodelay on;
keepalive_timeout 65;
types_hash_max_size 2048;
server_tokens off;
include /etc/nginx/mime.types;
default_type application/octet-stream;
ssl_protocols TLSv1 TLSv1.1 TLSv1.2;
access_log /var/log/nginx/access.log;
error_log /var/log/nginx/error.log;
gzip on;
gzip_disable "msie6";
gzip_types text/css application/x-javascript text/xml application/xml text/javascript application/javascript text/x-js;
gzip_vary on;
gzip_proxied any;
gzip_comp_level 6;
gzip_buffers 16 8k;
gzip_http_version 1.1;
include /etc/nginx/conf.d/*.conf;
include /etc/nginx/sites-enabled/*;
}
server {
listen 443 ssl;
server_name www.*****.org;
ssl_certificate /etc/letsencrypt/live/***.org/fullchain.pem;
ssl_certificate_key /etc/letsencrypt/live/***.org/privkey.pem;
ssl_protocols TLSv1 TLSv1.1 TLSv1.2;
ssl_prefer_server_ciphers on;
ssl_dhparam /etc/ssl/certs/dhparam.pem;
ssl_ciphers *****;
ssl_session_timeout 1d;
ssl_session_cache shared:SSL:50m;
ssl_stapling on;
ssl_stapling_verify on;
add_header Strict-Transport-Security max-age=15768000;
root /var/www/****/web;
if ($http_user_agent ~* (libwww-perl) ) {
return 403;
}
location ~ /.well-know{
allow all;
}
location / {
try_files $uri /app.php$is_args$args;
}
location ~ ^/app\.php(/|$) {
fastcgi_pass unix:/var/run/php5-fpm.sock;
fastcgi_split_path_info ^(.+\.php)(/.*)$;
include fastcgi_params;
fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name;
}
error_log /var/log/nginx/***.log;
access_log /var/log/nginx/***.log;
location ~* .(jpg|jpeg|png|gif|ico|css|js)$ {
expires 1d;
}
}
Any idea? Thanks in advance