I'm a bit confused on what you really want.
You are mentioning a lot of concurrent accesses to the remote site, so maybe you do not want to check its availability but its performance.

If that is the case, I'd not recommend Mechanize for that task, there are tools that you can use, like Apache Benchmark or JMeter.

To check for the availability of the server you can do less frequent requests, and for this it does not really matter if you use Mechanize or just LWP.

In reply to Re: testing availability of a http server using WWW::Mechanize and multiple proxies by olus
in thread testing availability of a http server using WWW::Mechanize and multiple proxies by spx2

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