Physics2D AddForce problems

I'm using AddForce to move my player, and when I run it in the editor, it works great. However, if I build and run it, the forces added seem to be less than when playing in the editor, meaning the player moves a lot slower. It is even worse when running in editor with the animator tab open(much slower than in a build). I have no idea why this is, and cannot seem to figure it out. The script I'm using is below. Thanks for any help!

 using UnityEngine;
 using System.Collections;
 
 public class PlayerMove : MonoBehaviour
 {
     public float moveSpeed = 1f;
     public float jumpHeight = 3f;
     public float thrusterPower = 1f;
     public Transform lineStart, lineEnd;
     public bool isGrounded;
     public bool thrusterEnabled;
 
     void Update ()
     {
         if(Input.GetKey(KeyCode.D))
         {
             rigidbody2D.AddForce(Vector2.right * moveSpeed);
         }
 
         if(Input.GetKey(KeyCode.A))
         {
             rigidbody2D.AddForce(-Vector2.right * moveSpeed);
         }
 
         if(Input.GetKey(KeyCode.Space))
         {
             rigidbody2D.AddForce (Vector2.up * thrusterPower);
             thrusterEnabled = true;
         }
         else
         {
             thrusterEnabled = false;
         }
 
         if(Physics2D.Linecast(lineStart.position, lineEnd.position, 1 << LayerMask.NameToLayer("Floor")))
         {
             isGrounded = true;
         }
         else
         {
             isGrounded = false;
         }
 
         if(isGrounded == true)
         {
             if(Input.GetKeyDown(KeyCode.W))
             {
                 rigidbody2D.AddForce (Vector2.up * jumpHeight * 100);
             }
         }
     }
 }

Also, I have a very powerful computer and checked the processes panel and i was only running at 12% memory and 30% CPU.