Friends, I am trying to get the data of Twitter users by ID, via API, but as I'm using WHILE is VERY slow. My script is correct? Can you help me find a solution?

PHP Code:
<?php
    
require_once('config.php');
    
    function 
user($id){
        
$jsonurl "https://api.twitter.com/1/users/show.json?id=".$id."&include_entities=true";

        
//Retorna o conteudo do arquivo em formato de string
        
$json file_get_contents($jsonurl,0,null,null);

        
//Decodificando a string e criando o json
        
$json_output json_decode($json);
        
        return 
$json_output->screen_name;
    }
    
    function 
img($id){
        
$jsonurl "https://api.twitter.com/1/users/show.json?id=".$id."&include_entities=true";

        
//Retorna o conteudo do arquivo em formato de string
        
$json file_get_contents($jsonurl,0,null,null);

        
//Decodificando a string e criando o json
        
$json_output json_decode($json);
        
        return 
$json_output->profile_image_url;
    }
        
    
$sql mysql_query("SELECT * FROM content");
    while ( 
$filter mysql_fetch_object($sql) )
    {
      echo 
'<img src="'.img($filter->user).'" width="50" height="50" alt="" /><br />';
      echo 
user($filter->user). '<br /><br />';
    }