Why is my bluetooth(r) connection slow, User guide, How to use troubleshooting – Sony SVE14A390X User Manual
Page 436: List of topics

Personal Computer
E Series
SVE14A3
Why is my BLUETOOTH(R) connection slow?
Data transfer speed depends on obstructions and/or the distance between the
two devices, radio wave quality, and the device configuration or apps in use.
Move your VAIO computer and BLUETOOTH device closer to each other.
If a version of a BLUETOOTH standard employed on the BLUETOOTH device
with which you want to communicate is not the same version as the one
employed on your VAIO computer, the communication speed may become
slower.
If your VAIO computer is compliant with BLUETOOTH high speed technology
and the following two conditions are met, high-speed communications are
available. However, some BLUETOOTH profiles do not support high-speed
communications.
The BLUETOOTH device with which you want to communicate supports
BLUETOOTH high speed technology.
Both the Wi-Fi(R) (Wireless LAN) and BLUETOOTH functions on the computer
are enabled.
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