The theoretical max speed of Bluetooth 1.1 is 723 Kilobits per second (Kbps). That speed can only be achieved in perfect conditions, with no interference or walls, direct line of site, 0 degree celsius temperature, optimal performance of the chipsets, and angels singing from above.
You said you're getting speeds in KB, or KiloBytes? There are 8 bits in a byte, so multiply your estimates by 8 to figure out what speed you're getting in Kbps, the standard measurement. If you get anywhere near half of the theoretical maximum then you're doing ok. Based on what you said below, your Bluetooth Nokia 3650 and Bluetooth Sony Ericsson 1010 are getting around 200 Kbps, which is the equivalent of a slow DSL line. That's not great speed, but not terrible. I'd worry about the Bluetooth speed of your Motorola though. That's slow.
Reasons why it could be slow: Class 3 Bluetooth spec in your phone isn't very powerful, it's designed for optimal battery life and limited range; high interference area- your cell phone, microwave, radio, computer, wifi router, TV, and all your neighbors devices are slowing you down; the design of the PCB circuit board inside your phone could have been poorly engineered and put the Bluetooth chipset too close to the antenna or some other high interference circuit.
Also, you could be trying to transfer datas to another bluetooth device that just isn't very compatible. Sometimes chipsets inside of two devices don't like each other and they just don't work well or not at all.
What can you do about it? Use your phone with higher power Bluetooth devices. Get Class 1 or 2 devices to connect with whenever possible. You won't get the increased range of Class 1 or 2, but you might get better speed and better distance than what you're getting now.
Good luck! If you're looking for more info check out BlueEssentials.com. If you have more questions feel free to use the contact page and we'll get back to you with good answers.
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