Our engineers have investigated further and here's what they had to say about the issue...
If it is the SBC codec used in many Android devices, there will be a latency of about 220ms.
There is no problem with the aptX codec.
This latency also occurs when the Bluetooth device sends a command to stop playback.
So for users experiencing a delay, they're most likely using the SBC codec. Unfortunately, this codec issue is a problem with the device and is not something that can be resolved within the app.