Histograms of precision (left column) and relative speed (right column) of the approximations used during the calculation of the LCs of EBs with eccentric orbits. The interpolation approximation (Sect. 7.2.1) in the top row and the symmetrical counterparts approximation (Sect. 7.2.2) located in the second row were tested separately. Both runs also utilised the similar neighbour approximation (Sect. 7.2.3). A benchmark consisting of 10 000 randomly generated binary systems evaluated the precision and speed of both approximations. The process of generating the data set is discussed in detail in Sect. 7.2.4. Histograms demonstrate that the constraints put in place during the evaluation of approximations were able to constraint the maximum value of residuals below 2 × 10⁻⁴, while providing a significant improvement to the computational speed.