About JVM Options

• Options that begin with -X are non-standard (not guaranteed to be supported on all VM implementations), and are subject to change without notice in subsequent releases of the JDK.
• Options that are specified with -XX are not stable and are not recommended for casual use. These options are subject to change without notice. 

Don't expect to see abnormal tps increasement by using an option something like [-XX:+StringCache] this is why i am telling this here.

-XX:+StringCache : Enables caching of commonly allocated strings.

But it would be GREET :) if works huh ?