We use advanced 3D EM simulation tools to improve critical portions of the high-speed lane routing, such as vias, component, and connector areas. From the simulation, the designer gets information on impedances of the routing at different locations and S-param models showing the frequency response of the transmission path. S-param model allows tuning of equalization for the path when available. We also run lower frequency (<< 5GHz) analysis showing signal waveforms which are used to tune driver strengths and terminations. This is often the case with fast clock signals and memory interfaces (e.g. SC cards and DRAMs).