How to reduce audio latency

I have a Pi4 with a HiFiBerry DAC+ ADC Card and Amp60 on top.

Plays really nicely using piCorePlayer which is simple and clever. However using this to output my TV in the Kitchen to ceiling speakers there is a 6 second delay in the sound compared to the TV video.
I am using pcp-streamer to send the audio to the localhost LMS.

Is this sort of latency to be expected?
Is there a way to improve the latency