A method for measuring the high speed behavior of fiber optic transceivers and transceiver modules. The method includes providing a fiber optic transceiver, performing one or more low speed performance tests on the fiber optic transceiver at each of a plurality of temperatures across transceiver operating temperature range, and performing a high speed performance test suite on the fiber optic transceiver at a single temperature within the testing temperature range. Based on the low speed performance tests and the high speed performance test suite at the single temperature, the method can determine, via calculation, approximation or prediction, the high speed behavior of the transceiver over temperature. The basis for determining the high speed behavior of the transceiver also can include the measured or available modeled relationships of high speed performance characteristics of at least a portion of the transceiver to the temperature-dependent parameters measured in the low speed performance tests.