I expected the throughput of the gzip process to be a lot higher, to be honest. Bot the random data and the stream of zeros took a noticeable time to compress.

I expected the throughput of the gzip process to be a lot higher, to be honest. Bot the random data and the stream of zeros took a noticeable time to compress. In a video game or real-time mpeg stream decoding job, the video card has to generate this amount of data 30-60 times per seconds. So 0.4-1.6 seconds to compress the result seems long in comparison. I tested the 2 extreme situations I could think of: ultimate random and ultimate order. Images will fall somewhere between these 2 limits, so on my PC, the PNG compression has a lower bound of 0.4-1.6 seconds to write an image with the current algorithm.