Quick answer yes.
You are currently using a 512 kb/s (Kilo bits per second)
Which equates roughly to 64k/s (Kilo bytes per second) (8 bits to the byte) (you should only see your download speed to be about 56k/s which is normal)
and as you are running a 11mbs (Mega bytes per second) (1024 Kilo bytes to the megabyte) there is plenty of spare capacity on your wireless network.
Long answer will often depend on what you are connecting too.. you can only download as quick as the server can upload!