Slower physics on Android (LG G4)

Unity Engine
,
1

My issue is that a game running smoothly on PC is running considerably slower on my LG G4. It is a 2D game and I am using 2D physics, moving objects with their rigid bodies. I am new to Unity but not programming and not video game design.

I have seen a lot of posts about worse performance on Android. In my case, the current project is so simple that is never dips below 60 FPS, according to the profiler. The closest issue I have found is this post:

It seems very similar to my problem, but the answer did not help me. Although it does seem to be delta time related, it’s selective. For example, I have timers with the following code:

void Update()
{
    if (!paused && runTime < length)
        runTime = Time.realtimeSinceStartup - startTime;
}

This is used as enemy spawn and bullet fire rate timers. It is the same on PC as it is on my phone. However, in the case of bullets:

void Start()
{
    m_rigidBody = GetComponent<Rigidbody2D>();
    m_rigidBody.velocity = velocity;
}

Velocity is the same both PC and the phone, but the bullets move MUCH slower on the phone. As a matter of fact, everything does. There’s even control for the player that, for reasons of how I handle input, I am moving in the Update() function. Here is a snippet:

if (playerPos.x < pos.x)
{
    if (m_velocity < 0f)
        m_velocity = 0;
    m_velocity = Mathf.Clamp(m_velocity + acceleration, -maxVelocity, maxVelocity);
    playerPos.x += m_velocity * Time.deltaTime;
    if (playerPos.x > pos.x)
    {
        playerPos.x = pos.x;
        m_velocity = 0f;
    }
    if (playerPos.x + halfWidth > levelBounds.max.x)
    {
        playerPos.x = levelBounds.max.x - halfWidth;
        m_velocity = 0f;
    }
}

From my understanding, Unity handles delta time in its physics. Perhaps physics is being updated fewer times per frame on the phone or something… I just really can’t figure out what I’m missing but it does almost feel like there’s a setting I’m unaware exists and I need to toggle a checkbox.

2

Bump.

Let me know if I need to add any more information.

Also let me know if this should be in a different forum.

3

I was able to figure this out for myself, so anyone else who reads this know that it doesn’t have anythign to do with the G4 phone.

In this case, it was upscaling. I was testing the game in 720p on PC. On the phone it was 1080p. I have the sprites set to scale with the camera. So physics was moving at the same speed on the phone, but it was moving a bigger sprite on a bigger screen the same amount, creating the illusion that it was moving slower.