You say download speed, but are we talking Internet download speed or local network performance? Must admit I haven't bothered to test my local network speed, largely because these days the router, with storage and printer attached, does everything I need and so there's no longer any need to run a domain LAN with a PC as the server.
I doubt I'd get more than 100Mbps out of the WLAN though, too many thick walls in this place. I really must get some 802.11ac kit but since most of my devices only support 802.11n built-in then there's not a lot of point, and the main work PC is networked on CAT6 under the floor. I only really need good speed to the work PC so..