How many contacts can the iPhone hold....now?

This question was asked back in 2008 and has been archived, however I'd like to revisit this issue.
What I'd like to know, is this:
How many contacts can the iPhone hold before it effects performance?
I have a iPhone user with an MS Exchange email account on the phone, Calendar and Contact sync is turned on. The problem is, the user has 10,000 contacts.
The contacts synchronized to the iphone, however, when writing emails or doing any task that accesses the contacts database (i.e. auto-completion of names), There is a good 35 to 40 second lag before you can enter the second letter of a name on the keyboard. I can only assume that this is due to the pure insanity of having 10,000 contacts on a mobile device... The search takes too long. Although it did work just fine on the blackberry (a lessor device ).
Can anyone tell me if there is a limit on how many contacts one can successfully store on an iPhone without running into the "lag" issue?
Thanks in advance.
Nigle

What is the overall size of all these songs?
This will determine how many songs the iPhone can hold.
The actual capacity of an 8GB iPhone is around 7.3 GB - OS X alone takes up approximately 500MB.
You should leave some free space available on the iPhone for general operating purposes and if you access any email accounts and for Safari cache purposes, etc.
So you have around 7GB available - as long as the overall size of all 9400 songs isn't greater than 7GB or so, you are covered.

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