Increasing the economical efficiency of single screw extrusion is an important factor in the area of research and development in extrusion technology. Enlarging processing machines is an approach which raises the mass flow rate but at the same time increases costs for maintenance or batch changes. This is why the focus of this essay shall lay on increasing speed at a constant diameter in order to improve the output. Investigations with polyolefins show, that in terms of high-speed extrusion (from 2m/s on) special attention has to be paid on the partially poor feed behavior and the high processing temperatures. Building on the results based on previous studies, the investigation of amorphous thermoplastics (polycarbonate) in combination with high-speed extruders is being pushed on at the KTP institute. Because of the other molecular structure amorphous to partially crystalline (polyolefin) it can be assumed that already gathered knowledge in areas of feed behavior, temperature development or mixing homogeneity can be transferred only partly. This is due to the lack of melting enthalpy of amorphous polymers. This essay introduces the first observations of temperature homogeneity and pressure development partially at high-speed extrusion with polycarbonate. These observations are based on the evaluation of various speed ranges on an extruder (D=30) with vacuum degassing and torque direct drive. The measurements occur with a temperature sensor in the area of the screw tip and with several pressure sensors along the axial screw length. This arrangement allows making a statement about temperature homogeneity, pressure development and melting process. Based on these results, approaches to process optimization are introduced.