performance impact using symlinks

Does anyone know what type of performance hit, if any, occurs when you use symbolic links to access the majority of application files of your website?

I am creating several client subdomains (all housed on the same server) using a content management system (xoops) - Apache/PHP/MySQL/Perl. Instead of uploading the same application files to each different subdomain, I have created symbolic links to all the main program modules/files on my main reseller server, so most of the individual subdomain space will be used for picture and document uploads, instead of application files.

My basic concern is that if I have dozens of subdomains symlinked to the same set of core files, even though they are all housed on the same server, will this significantly impact the performance of all the sites?

Thanks for any help or insight...

 

 

 

 

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