Improve physics

backend/src/helper/delta-time-calculator.ts

@@ -0,0 +1,12 @@
+export class DeltaTimeCalculator {
+  private previousTime: [number, number] = process.hrtime();
+
+  public getNextDeltaTimeInMilliseconds(): number {
+    const deltaTime = process.hrtime(this.previousTime);
+    this.previousTime = process.hrtime();
+
+    const [seconds, nanoSeconds] = deltaTime;
+
+    return seconds * 1000 + nanoSeconds / 1000 / 1000;
+  }
+}