Hello
As for the maximum speed for sending push notifications through the WNS service, the specific rate limits are not explicitly mentioned in the sources I found. However, it’s noted that you can view your monthly notification usage against allowed tiering limits. The maximum notifications allowed is set to 20,000, and the total pushes in the time period is 1,000. This suggests that there are some limitations, but the exact numbers might vary based on different factors.
If you require specific information regarding maximum speeds or limits for WNS, I recommend reaching out to Microsoft directly through their developer support channels or consulting their official documentation for any updates since my last training data.