Instructables image quality
Am I just imagining it, or did Instructables' thumbnail and preview images used to be much higher quality than they are now? Personally, I'm a fan of PNGs for their lossless compression, but I'm fine with lossy formats like JPEG as long as the quality is high enough that there isn't blatant distortion all over. But when I look at thumbnails and preview pictures on instructables now, I can't help but notice how crappy they look with all the distortion.
My question is whether the decision to use low quality thumbs/previews was made in order to conserve disk space, reduce bandwidth, or improve load times?