My game have FPS drops when Input.GetKey is triggered

Questions & Answers
1

Hi there. My game drops from 400fps to 260fps when I press any inputs I set in my script. Notice that even having the player static (as in, he’s not moving when I press an input. Only calculations happen) the FPS drop is still here.

Here’s some code:

void Input(){
if (isGrounded && fullControl)
        {
            inputDir = Vector2.Lerp(inputDir, Vector2.zero, recoverSpeedRate * TimeConstant);
        }

        if (isGrounded)
        {
            //Basic input
            if (Input.GetKey(KeyCode.W))
            {
                inputDir.y = 1;
            }
            if (Input.GetKey(KeyCode.S))
            {
                inputDir.y = -1;
            }

            if (Input.GetKey(KeyCode.A))
            {
                inputDir.x = -1;
            }
            if (Input.GetKey(KeyCode.D))
            {
                inputDir.x = 1;
            }
}

void SpeedManager()
    {
        //Sprinting
        if (isSprint)
            speed = SpeedInterpolation(sprintSpeed, recoverSpeedRate);
        //Crouching
        else if (isCrouched)
            speed = SpeedInterpolation(auxMoveSpeed / 2, recoverSpeedRate);
        //Sliding
        else if (isSlide)
        {
            fullControl = false;
            if (terrainSlope > 10f)
                speed = SpeedInterpolation(speed + Mathf.Abs(transform.position.y), 0.5f);
            else
                speed = SpeedInterpolation(auxMoveSpeed, 1f);
        }
        else if (isGrounded)
        {
            speed = SpeedInterpolation(auxMoveSpeed, recoverSpeedRate);
            fullControl = true;
        }
    }

    float SpeedInterpolation(float finalSpeed, float _time)
    {
        float speedInterpolation = Mathf.Lerp(speed, finalSpeed, _time * TimeConstant);

        return speedInterpolation;
    }

Hope you can at least help me brainstorm. Any help is appreciated :slight_smile:

2

Hi there @Suave ,

I’m just starting to use Unity, but I ran into a similar problem as you described with GetKey. What worked for me was to close Evga Precision XOC program. I saw this suggestion in another thread, and when I exited Precision the FPS drops disappeared. Don’t ask me why, but it worked.

Of course, if you don’t have Precision, then I’m afraid I can’t help you :).

Good luck!

3

“Drop” from 400 fps to 260 fps is not a framerate drop, it’s a measurement error.
What’s more, no gaming system known in 2021 needs more than 90 fps. All framerate > 90fps is just inefficient home heating.
_
What you describe represents CPU time increase from 2,5 ms to 3,8 ms. And while whopping 1 ms is, yes, a lot of sweet CPU time indeed - this probably represents no properly isolated measurement. Because at fps range this high 1ms might be anything really - and you need to look into Profiler window to know something about that.