sometimes speedtest isnt a perfect way to measure, unless you able to measure the speed direct to your isp.

for most of us 30mbps is good enough(for single user), what trouble us is when there are multiple users need to use the internet at the same time.

like speedtest only connect to a point and try to use the max speed to/from that point, but if multiple users use internet at the same time, 99% of all the time they do not access to the same server/ip, so even you get max speed like 30mbps from a server, you can still get higher from multiple servers.