I use it for one of my clients to send an average of 400k browser push notifications, competitors send then in 40 minutes. With Lambda + kinesis firehose(16 sha

I use it for one of my clients to send an average of 400k browser push notifications, competitors send then in 40 minutes. With Lambda + kinesis firehose(16 shards) my solution is able to send them in less than 4 minutes.