As stated in the web site: Compared with Tokyo Cabinet, KC is superior in concurrency, usability, and portability. Although time efficiency for single-thread i

As stated in the web site: Compared with Tokyo Cabinet, KC is superior in concurrency, usability, and portability. Although time efficiency for single-thread is better in TC, I recommend KC from now on because multi-core/many-core CPU has been popular. However, I will keep on maintaining TC and fix bugs if they are found.