Differences between textures 600x800 and 1920x1080

Development Rendering
1

Does the performance decrease if I use high quality texture? Whats differences between 600x800 and 1920x1080 ?

2

Yes higher resolutions decrease performance, but don’t use those resolutions, use dimensions that are a power of two: 32,64,128,256,512,1024,etc.

3

So,which one is the best resulution ?

4

7680x4320 is the best.