No, scale shouldn’t have an effect on efficiency as a normal rule.

Under the hood, scale is dealt with as a part of the matrix multiplication within the graphics pipeline that transforms vertices from mannequin house to display house. This matrix multiplication occurs it doesn’t matter what scale worth you employ, and multiplying by 1 has the identical price as multiplying by 1000, so growing the dimensions quantity itself doesn’t price something further.

There are two potential exceptions, the place growing scale has a aspect impact that can have an effect on efficiency, however they need to not apply to your case:

• When an object will get greater, it will probably occupy extra pixels on the display. That means the pixel shader of its materials will get invoked extra occasions, and also you spend extra of your fill charge (the utmost variety of occasions your GPU can write a pixel worth into an output buffer in a unit of time) drawing it. For an costly shader, or instances the place your recreation is fill charge sure, this could have an effect on efficiency.

  In your case, since a background picture is often masking the entire display anyway, you shouldn’t observe a distinction on account of this impact.

• When an object has a physics collider, that collider must be sorted into acceleration buildings to optimize collision checks and physics calculations. When objects are very very giant, it is more durable to cull them throughout collision checking as a result of they may doubtlessly be touching so many locations in your scene. That can improve processing prices.

  Large and heavy objects may also make some collision and constraint decision calculations much less steady – particularly after they collide with a lot smaller/lighter objects, and this could trigger seen jitters or glitches. Usually physics engines are optimized to work finest with objects starting from a couple of tenths of models to tens of models in measurement, so holding most objects on this vary might be good for stability.

  But once more, in your case, background photographs often have no physics related to them, so you shouldn’t anticipate this to use right here.

Overall, the easiest approach to learn the way one thing impacts efficiency in your recreation, working in your goal {hardware}, is to strive it and use the profiler to measure the impression. This will get you verifiable proof, slightly than rumour from strangers on the Internet, so all the time make this your go-to methodology for studying about your recreation’s efficiency.