Help debugging / correcting wireless speed issue

[CS DBA]

Hi All;

I'm switching from Mac back to Fedora, my new Fedora laptop is a Lenovo 
W540 with this card:

Intel Dual Band Wireless 7260AC


I posted about issues earlier, which I've been able to resolve via a 
clean install. The wireless and wired connections connect immediately 
and behave as they should.

However, the Fedora laptop connected to my local access point shows a 
download speed of 1.63Mbps, while the mac, running the same test from 
the same site (http://speedtest.comcast.net) shows a download speed of 
26.89Mbps

Both laptops are sitting on the same desk, same distance from the access 
point

I don't expect exact matching speeds but this is a dramatic 
difference... can anyone help me debug / correct this?

Thanks in advance