public long getElapsedStartup() {
        return valueOrBuildStartedTimeIfNotInitialized(buildStarted) - valueOrBuildStartedTimeIfNotInitialized(profilingStarted);
    }

    /**
     * Get the total elapsed time (in mSec) between the start of profiling and the buildFinished event.
     */
    public long getElapsedTotal() {
        return buildFinished - valueOrBuildStartedTimeIfNotInitialized(profilingStarted);
    }

    /**