Question Blend Node Performance

I want to create shader that will put face parts textures on a face. Different eyes sets, different noses etc.
The way I choose to do it is by using blend node extensively. Blending eyes texture, blending mouth with mouth color, blending everything basically.
Would there be a perfomance problem with that node? I cannot use any other node like "Add" because it don't work great with transparency.

 

Different blend modes only contain a different amount of simple arithmetic and should not impact the performance in any meaningful way. What can be more expensive performance-wise in your case, is the amount of textures you need to sample for face parts. Though if your characters' faces do not fill a big part of the screen and there is not a crazy amount of textures, that should not be an issue either.

 

Thanks, there are 6 layers of textures, they are not very big though, 64x64. Does the size matters in this situation, or the mere amount of textures?