How to make a huge hollow sphere/sphere

hey everyone this is how to make a huge hollow sphere if u have world edit do //hsphere 20 iron,glass,diamond and it will work! :D If you want a full sphere do //sphere 20 iron,glass,diamond and than it will work but if its pass 20 it will lag it depends on how large of ram your server has if it has 2050mb it shuld only be ableto go up to 10 a 1gb server i have test was only able to go up to 25 without lag and if it gos up to 30 it will lag for a min