It is known from literature, the Fortune's algorithm works in O(n log₂ n) time and that it is one of the simplest algorithms for constructing the Voronoi diagrams. Table 1 shows the obtained measurements of spent CPU time for different number of points. It can be concluded that the theoretical time complexity estimation is achieved also in practice. The algorithm is implemented in C++ and the measurements have been done on PC Pentium 133 MHz and 64 Mbytes RAM. The results of construction can be seen in Figure 11.

Table 1. Measurements of spent CPU time

No. of points	2000	4000	6000	8000	10000
Spent CPU time [s]	3.86	7.61	11.73	16.84	22.31