Rigidbody fall speed slow

Questions & Answers
1

I have a sphere as my player and I made a script for movement on Z and X axis with rigidbody using velocity. But my sphere is falling very slow, I tried putting gravity to -1000 but its still really slow. I added a cube with just rigidbody no script and it fell fast.

Movement Script!

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class Movement : MonoBehaviour
{
    
    private Rigidbody rb;
    public float moveSpeed;
    public float gravity;
   
    void Start()
    {
        rb = GetComponent<Rigidbody>();
    }

    void FixedUpdate()
    {
        float horizontal = Input.GetAxisRaw("Horizontal");
        float vertical = Input.GetAxisRaw("Vertical");

        Vector3 movement = new Vector3(horizontal, 0.0f, vertical);

        rb.velocity = movement.normalized * moveSpeed * Time.deltaTime;
       
    }
}
2

You are setting your y-velocity to 0 in every FixedUpdate, thus your character can never really get up to speed in the y direction. You have to maintain the current speed in that direction. To do this your are setting the y-velovity to the value it already is.

rb.velocity = movement.normalized * moveSpeed + new Vector3(0.0f, rb.velocity.y, 0.0f);

Moreover, you do not want to use deltatime with velocities of rigidbodies, as the rigidbody already is frame rate independent and takes over the calculation for you, see also http://answers.unity.com/answers/282011/view.html