Node.js Unpredictable

let startTime = process.hrtime();
if (centerPoint.getDistance(Mep.Position.getPosition()) < this.config.hazardObstacleDistance) {
    let target = this._targetQueue.getTargetBack();
    if (target !== null) {
        let line = new Line(Mep.Position.getPosition(), target.getPoint());
        if (line.isIntersectWithPolygon(polygon) === true) {
            // this.emit('pathObstacleDetected', true);
        }
    }
}
let diffTime = process.hrtime(startTime);
console.log('Diff time', diffTime[0] * 1000 * 1000 + diffTime[1] / 1000, 'microseconds');


/*
Results:

Diff time 2935.336 microseconds
Diff time 739.212 microseconds
Diff time 97.603 microseconds
Diff time 96.093 microseconds
Diff time 90.832 microseconds
Diff time 89.426 microseconds
...
...
*/