In order to estimate the average rate of data processing, we have carried out the following experiment. We encrypted 8 GB of data using the fast encryption implemented in Python and C and consequently found how much data is encrypted in one second in average. Optimized implementations with precomputed tables as described in this paper demonstrated 5.4MB/s for Python code and 114MB/s for C code. Encryption of a single block with the optimized version takes in average 0.102 µs for Python implementation and 0.011 µs for C implementation. This fact means that the native compiled code in C encrypts approximately 10 times faster compared to the Python byte code. The speedup caused by the precomputed tables optimization reaches 54 times in average for the C native code compared to the original C implementation that employs multiplication of polynomials