How much of a performance gain using powers of 2

[ecsancho]

As I'm here creating textures I was wondering how much of a performance gain you get from using textures sizes in powers of 2. Is it a huge gain? Thanks

[xerver]

Basically none, it has more to do with feature support and memory usage than performance. Use POT if you can (because the GPU will make it POT anyway), and some features (mipmapping, for example) may not work on certain GPUs unless they are POT.

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[ecsancho]

Gotcha thanks for the answer 

[ecsancho]

Is there a performance increase using smaller textures sizes or is that just a memory thing as well?  2048x2048 vs 1024x1024

[themoonrat]

For mobile, I'm happy with 2048x2048. Most devices do support 4096x4096 now, but I found that some devices would stutter sometimes, when the texture was being uploaded to the gpu, and older iphones showed weird artifacts But you want as few texture swaps as you can, which rules out 1024x1024. So 2048x2048 was the sweet spot for my needs

[xerver]

The only performance difference is that you have to upload textures to the GPU, the larger it is, the longer it takes to upload. But usually you only upload once, and then you're done.