CPU

The best way to overclock Raspberry Pi it is with the raspi-config tool

raspi-config

I go for the Modest option:

 

Nginx

Modify nginx.con (/etc/nginx/nginx.conf)

We only have one CPU thread…

worker_processes  1;

In the http { section add the following:

# Optimize memory

open_file_cache max=1000 inactive=20s;

open_file_cache_valid 30s;

open_file_cache_min_uses 2;

open_file_cache_errors on;

sendfile        on;

tcp_nopush     on;

server_names_hash_bucket_size 128;

keepalive_timeout  65;

# Enable website compression - it takes a lot of CPU

# If you are running low on CPU disable the Zip part.

gzip  on;

gzip_http_version 1.1;

gzip_vary on;

gzip_comp_level 6;

gzip_proxied any;

gzip_types text/plain text/html text/css application/json application/x-javascript text/xml application/xml application/xml+rss text/javascript application/javascript text/x-js;

gzip_buffers 16 8k;

gzip_disable "MSIE [1-6]\.(?!.*SV1)";

Also it is usefull to add:

#Hide Nginx version number
 server_tokens off;

 

 MySQL

Download and run this script: MySQL Tuner Perl script

perl mysqltuner.pl

then go to /etc/mysql/ and edit my.cnf accordingly.