Multiple AJAX requests on a page efficiency

I have an application of which loads around 5 sections of data using AJAX.

I find that on load of the application, sometimes (1 in 8) one or more of the sections hang and sometimes does not complete.

The AJAX requests are POST/AJAX requests and populate div containers with the associated php/html from the server.

They are not too bulky.

I was wondering why this might be happening? Is there a more efficient way of handling multiple AJAX calls? Perhaps ordering them? Do they perhaps cause issue with the server if multiple requests are sent at the same time?

Copyright Notice：Content Author:「Derple」，Reproduced under the CC 4.0 BY-SA copyright license with a link to the original source and this disclaimer.
Link to original article：https://stackoverflow.com/questions/24327725/multiple-ajax-requests-on-a-page-efficiency

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