hy friend so this is not
      // needed.
      if (title === 'v8_runtime') continue;
      totalBlockedDuration -= component.total;
    }

    breakdownTree.blocked_on_network = {
      // Clamp breakdown at 0 to prevent negative values.
      // TODO(#4299): Since we do not explicitly prevent overlapping slices on
      // the same thread, slices can end up with negative wall clock self time
      // and thus breakdown values can be negative. If we can prevent
      // overlapping slices in the model, we 