What are the Digital certificates of hardware computations

Digital certificates are highly dependent on hardware computations, it is essential that mechanisms are evolved to increase the speed of computing by various means such as parallel processing, provision of additional processors, separate hardware for protection, etc. Assume that a number of users log on to the server, then in such an event it is sure to face a bottleneck at the security gate since it would take considerable time in processing encryption/decryption of the keys or certificates. Now-a-days, in order to reduce this kind of difficulty, a separate server called firewall server is placed in front of the main server. Anyone willing to access the main server has to get through this gate.