1.) Server processor speed.
Of course this will change indexing speed
2.) Server OS.
Linux should be faster (it is for MySQL)
3.) Internet bandwidth of server.
If you index site that aren't on the server, of course it mather
4.) My client script on my browser.
No, this should't change anything
5) PHP configuration
If you have a low memory limit and so on it can slow indexing process
6)Load of your server
If there's ressource intensive scripts on your server this can also be scripts of your neighbours (if you're on a shared server) this can slow down indexing. Try to know where your server is located (I mean lot of european server are located in USA) to choose the right hour to do the job.
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