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RM46L852: send data in 20ms intervals in TCP Client mode using LWIP

Part Number: RM46L852

I am using RM46L852 and using LWIP Library to connect to TCP Server in TCP Client mode to send and receive data.
After connecting to the TCP Server using the tcp_connect function, I send data to the TCP Server using the tcp_write function, and I want to send data every 20ms.

However, the TCP server is receiving data every 300ms.
I think the RM46L852 is transmitting data in 300ms intervals, and I was wondering if there is a way to reduce the interval to 20ms.
Whether I send in 20ms cycles or 100ms cycles, the TCP Server receives the data in 300ms cycles, and the EMACCore0TxIsr interrupt occurs in about 300ms cycles.

If there is a way to send data in 20ms intervals, please let me know.
If not, what is the smallest interval you can send from the TCP Client?