I realized that you output tuples of addresses using list(map). I suggest to adjust your program so it outputs a single address on each line so we compares apples by apples. I am not sure if the list output affects performance in some way, that's why I am pointing to it.

The example I originally showed using iceland2k14/libsecp256k1 was about half the speed. With it I can generate 1 million addresses using all cores (in my case 16 cores) and write to the file in 4.8 seconds, this is a rate of about 208,300 keys/sec. I have modified my initial program so that you can now also configure the cores under which the program is executed. So one can select specifically "1" as value, so that we also compare apples with apples.