very long CS with SPIDEV1


I’m trying to do some SPI programming on BBB using SPIDEV1 and based on examples and it works, but not satisfactory …
The length of CS is about 1.4ms no matter what is the clock (SCK) speed.
I transfer 2 bytes and the transfer start almost immediately after CS goes low, but then CS stays active low for a long
time after CLK and MOSI are gone.
Is it normal or am I doing something wrong?
I need a higher speed than what I have now.