A screw compressor (20) has a housing having first and second ports along a flow path. A male-lobed rotor has a first rotational axis. A female-lobed rotor has a second rotational axis and is enmeshed with the male-lobed rotor to define a compression path between suction and discharge locations along the flow path. The compressor has a compressor lubrication network having a lubricant outlet port (242) along a low pressure cusp (244). An unloading slide valve element (102) may be along a high pressure cusp (105).