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This may vary on your use case. In my case I have a separate database server and wanted to compress data to make it more efficient to send over.

Requires edit to inc\db_mysqli.php
Find

if($port)
{
$this->$link = @$connect_function($persist.$hostname, $single_connection['username'], $single_connection['password'], "", $port);
}
else
{
$this->$link = @$connect_function($persist.$single_connection['hostname'], $single_connection['username'], $single_connection['password']);
}

Change to

$this->$link = mysqli_init();

if($port)
{
mysqli_real_connect($this->$link, $persist.$hostname, $single_connection['username'], $single_connection['password'], $port,0,MYSQLI_CLIENT_COMPRESS);
}
else
{
mysqli_real_connect($this->$link, $persist.$single_connection['hostname'], $single_connection['username'], $single_connection['password'], '',0,MYSQLI_CLIENT_COMPRESS);
}