Sorry for the long post. I've had the new Pi Zero Wireless for a couple of days now, running Arch and everything's working fine apart from one thing. I found apps that worked well on the original Pi Zero are noticeably slower. In order to make this make reproducible, I installed and ran sysbench (never used this before, don't know if this is regarded as a good tool or not) on both. I ran the following:
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$ sysbench --test=cpu --cpu-max-prime=20000 run
Pi Zero W reported:
total time: 873.9604s
Original Pi Zero reported:
total time: 608.9308s
That's a massive difference and it was consistent when I ran the tests; I also have a later non-wireless Pi Zero which also completed the test in ~612 seconds. The Zero W's specs are the same, it just adds Wi-Fi and Bluetooth. So I really can't explain this. I'm using a good power supply that works fine for a Pi 3, so I don't think that's the issue.
I have been able to borrow a second Pi Zero W from a friend so I can rule out a fault with my own board. Also planning to re-run the test on the original Pi Zero with a USB Wi-Fi dongle attached. I'll also repeat the test with Raspbian, just to rule out any issues with Arch.
In the meantime, can anyone help to explain what I'm seeing here?