[Asus  Eee Pad Transformer Prime] gruntguy:
Hey guys, just hopping into this thread here. I ran my own test on my TF201 to see how the bluetooth affects WiFi.

I use a Wireless N router supplied by my broadband provider (BT). When in my bedroom (the router is in the hallway right outside my bedroom door), my TF201 connects at 'full' signal strength (all bars) at a network speed of 65mbs. I decided this was too close to run a test so I moved to the kitchen, a couple of walls away from the router. I placed myself at a far corner of the kitchen, as far from the router as I could get, and my netbook at the other end of the kitchen, so it sits in the middle of a direct line between me and the router. My signal strength here displayed as 3/4 bars at a network speed of 52mbs.

Having placed the TF201 down on a solid surface, I switched on bluetooth and began sending a large video file to my netbook, using the app "Wi-Fi Analytics" to monitor the signal strength with its graph feature. The signal strength dipped very slightly lower on average compared to when the bluetooth was turned off. It was also slightly erratic, increasing and decreasing by about 5dBm over time, drawing a sawtooth shaped graph. At the same time, I checked the network link speed which had dropped from 52mbps to about 36mbs, occasionally going as low as 19mbs.

After this portion of the test, I stopped the file transfer and switched off bluetooth. Leaving the TF201 exactly where it was, I monitored the signal strength graph and network speed again. The average signal strength seemed to rise back to it's normal position, and the graph was much smoother compared to when it was transferring a file. There were no sudden drops or increases in signal strength - Small curves rather than sharp peaks. Variation in signal strength was about 1-2dBm this time. The network speed also rose back up to its normal 52mbs.

Next test was the speedtest.net test. I ran 3 variations with different power modes and bluetooth activity:

1) No bluetooth, Balanced mode.

2) Bluetooth sending file, Power saver mode.

3) Bluetooh sending file, Normal mode.

I ran each of these tests 3 times to obtain averages and eliminate anomalies. Here are the results:

As you can see, without bluetooth active, both download and upload speeds are significantly quicker.

With bluetooth switched on and transferring a file, download speeds seem much more affected than upload speeds, and there seems to be a slight increase in download speed with the 'Normal' power mode, though the difference is well within experimental uncertainty. It can therefore be surmised that Normal power mode might give you a slight boost in speed, but this is uncertain given the small difference.

These tests were performed with the netbook and tablet remaining in the same positions the whole time. They were not moved at all and remained the same distance from the router. There are very very few electronic devices in my kitchen with wireless functionality, so local interference was kept as low as it could be (there is a bit more overall signal strength fluctuation in my bedroom for example).

I hope this data will be of some use to you guys. Maybe it will, maybe it won't. Either way I wish you all luck.

EDIT:

I'd just like to add that internet connectivity at no point became unusable during the testing. It did not disconnect or slow to a halt, and I was able to browse the web and load Google Image search results in quick succession.