While the basic idea of the Symmetric Delete spelling correction algorithm remains unchanged the implementation has been significantly improved to unleash the full potential of the algorithm.
This results in a 10 times faster spelling correction and 5 times faster dictionary generation and a less memory consuming dictionary compared to version 1.6 .
Compared to Peter Norvig's algorithm it is now 1,000,000 times faster for edit distance=3 and 10,000 times faster for edit distance=2.