As quickly Radius works

Hello !
Can you HELP me ?
I use Radius only for Voip Accounting (without SQL)
My question: Can GNU Radius to process 100-120 requests in a second?
If yes, Than how must I configure it ?

And second question: What maximal speed of processing of packages at Radius ?
What maximum quantity of packages which can expect processing in turn (the maximal value of parameter max-requests)? 
----------------
My config parameters:


option {
        source-ip 217.1.161.34;
        usr2delay 30;
        max-requests 1024;
};


acct {
        max-requests 127;
        request-cleanup-delay 15;
};

I try to change:
        max-requests 512;
        request-cleanup-delay 2;

But it has not worked .
Help me Please !