I use NXP NFC chip: NTAG I2C 2K Plus.

I try to use pass through mode to transmit the message from NFC to MCU. After testing by the NXP app"NTAG I2C demo", I find the speed of pass through mode can only reach 2831Bytes/s, while the guide book said it can reach 5kBytes/s.
I want to know how to speed up.