.
Please note that the JIT compiler is extremely fast (we are talking
about the microsecond to millisecond range). Disabling optimizations
doesn't have any visible impact on its overhead, but usually generates
code that runs slower.
</p>
<p>
The first form sets an optimization level &mdash; this enables a
specific mix of optimization flags. <tt>-O0</tt> turns off all
optimizations and higher numbers enable more optimizations. Omitting
the level (i.e. just <tt>-O</tt>) sets the default optimization level,
wh