XAMPP is pre-configured so it will effectively perform in a development environment even on a PC with low resources.
Before editing any conf or ini file first make a Copy of or backup of the original so you can always revert to the backup for a clean fresh start again.
Not absolutely sure if this will help but you may be able to tune Apache performance in the \xampp\apache\conf\extra\httpd-default.conf
file initially by increasing the MaxKeepAliveRequests value to say 500 or more, even to 0 for unlimited.
There may well be other tweaks in this conf files that could help, trial and error is usually the only course open to most of us - try reducing the KeepAliveTimeout to 2 for example.
The other configuration file that may help with performance tuning is the httpd-mpm.conf
file - Multi-Processing Modules.
The Multi-Processing Module (MPM) enables a specific platform to handle multiple concurrent connections. MPM modules are platform specific - Unix, Windows, BeOS, and NetWare - for most users the defaults for a particular platform work fine.
This file is governed by <modules> so look out for the module that applies to your platform for example # WinNT MPM
- trial and error applies here.
This docs link shows the WinNT MPM and the directives that can be used here:http://httpd.apache.org/docs/2.2/mod/mpm_winnt.html
This web search (link)
may also help.
Remember that if you make changes to any conf or ini file you must save the file and then restart Apache to test again.
Here is a link to a performance tuning article that might also help in your case.http://www.devside.net/articles/apache- ... nce-tuning
You could also do a web search for keywords:performance tuning apache for windows
Some of the core directives can be read here in the Apache documentation:http://httpd.apache.org/docs/2.2/mod/core.html
This performance tuning subject (topic) is not one I usually partake in as I have no need of performance in a development environment but I see many forum request for support on this issue.
Good luck and keep the forum posted as to your results.