First off, remember that there are 8 bits in a byte. Every Windows or Mac operating system generally tells you that you are working in bytes, because that is the measurement used for storage (bits are used for bandwidth/speed/networks/etc.). So, on my old Wireless G router, I would max out at 56 megabits per second. This gave me a theoretical maximum of 7 megabytes per second. Now, you will never, ever get that speed. The reason being is that there is electrical interference, internal wiring within your house, electrical devices, etc. that are going to affect a signal. Its also going to be affected by distance. The further away you are, the weaker the signal. This can be off-set by setting up repeaters or what-not, and many people do. Your best bet will be to do what I did - when I needed to do a lot of large file transfers, I plugged it into a hard wire or I did it overnight.
The other thing I did was get a USB Flash Drive. That made things much simpler.
Minolta 50/1.4, 80-200 HS APO G
Sony 18-135mm SAM, 35/1.8 SAM
Tamron Di 90mm/2.8