its diffucult to say
sometimes it reduces the serverload ( for things not everytime happening, like registration => username check=> so you know after you write your name in if the name is free or not, it it wouldnt be so, you have to write all information, send the whole form to the next site where it will be checked
on the other site in this example the part is reloaded all the time; its the same as you click f5 for reload the site
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