Herndon, Virginia-based Internet service provider PSINet Inc has launched its PSIWeb Web hosting service to help companies offer improved response times to their Web site visitors. PSI-Net puts the companies’ Web pages on its own Internet optimized backbone rather than having firms store them on their own servers. The benefit is that Web surfers get faster access to pages, thus helping prevent criticisms of poor Web performance, the company said. If you can’t ever get onto a company’s Web site, it creates a bad impression of the company, said Dorothy Briggs, PSINet marketing director. Company Web sites need to be of the same quality as other forms of media.