Develop/Edit PHP Sitemap Script

(No URLs are typed in this bid request.? They are located in the image below) I paid for and installed a dynamic (php) sitemap script a long time ago for my site (URL #1 Below). The site script is setup which creates a new sitemap with all the site's URLs. The script automatically generates a new sitemap when you go to the specific sitemap URL's (Sitemap URLs Below). In the script settings, you can specify the type of sitemap you want to generate. Each of the URLS below pretty much are the same file with the different type of sitemap specified in the file. Therefore, I do not need to create a new sitemap every time I add new pages to my site. Every time the sitemap URL is opened, it crawls all the page in the site (site has about 500 pages and growing), and then a new sitemap is supposed to be generated. I like this system and this script and I never had a problem with it until now. Lately, when the dynamic sitemap URL's are opened it has been causing an overload of system resources & it takes an extremely long time to crawl and generate the map. Sometimes, they don't load and it times-out or causes the VPS server to max out it's resources. Right now, I have a few files (attached) for the different types of maps that I have submitted to different search engines. They are all the same php file, but each has different settings to output different results & different types of maps. They are excuted with the URLS in this image; ![][1] I need someone to; -Look over the php sitemap make modifications to the script so that it doesn't overload my server's resources. -I also want the sitemap to load a lot faster and load correctly every time. -Provide me with a modified script that allows me to crease dynamic sitemaps (in RSS, XML (for google & general protocol format), TXT, and HTML) like I am able to with the script by adjusting the settings in the header of the .php file. -I need it to to load quicker and use less resources. But, I need to be able to do the same things with it...such as pick the type of map, exclude and include file types, set priority, etc. -I also want it to list all the regular page URLs (not miss any) on the site (with the exception of the filename and types that I have list in the script settings header).