While browsing, the speed keeps fluctuating. This happens because each request may have a different route to take to its destination and back. Each request will be able to travel only as fast as the slowest leg of the journey. That notwithstanding, the download speed should still be in line with what has been committed by the provider. Wave provides a speed test tool on its website which you can use to check the speed within the Wave network. To validate, you could also use similar tools provided by many other ISPs.