WHATS NEW IN WINRAR 4.20 FINAL?
Edition 4.20
1. Changes in RAR compression:
a) RAR common pressure formula is enhanced for better
utilization of several processer cores. While some rate gain
is possible even in individual processer method, best results
are obtained in multi-core atmosphere.

Speed obtain relies on information type and regular quality.
Several cores are used more effectively when compressing
large information files.

b) we had to increase storage specifications to accomplish higher
compression rate. General RAR pressure formula allocates
about 120 MB evaluating to 40 MB in WinRAR 4.11;