WAMP web server performance is slow under volume, but why?

Ive turned my laptop into a webserver using WAMP server software. I have a single basic static homepage.

I decided to put some volume on the site, so I emulated 50 users hitting the homepage. The average response times grew from .03 seconds to 20 seconds.

I expected this but i dont know what the performance bottleneck is.

Using perfmon I am watching around 20 counters, but they all seem fine. Any ideas?

Counters checking

CPU

%Processor Time

Processor\% Interrupt Time

Processor\% DPC Time

System\Processor Queue Length

system/context switches

Memory

Memory\% Available MBytes

Memory\% Committed Bytes In Use

Memory\Pages/sec

Disk

LogicalDisk\% Free Space

LogicalDisk\% Idle Time

LogicalDisk\Avg Disk Sec Per Transfer

LogicalDisk\Avg Disk Queue Length

Disk Transfers/Sec

Network

Network Interface\Bytes Total/sec

Process

%Processor Time

Process\Handle Count

Server

Queue Length