Slow REST Calls with ppp GSM modem ppp

[ikholiavko]

Hi
Hi everyone,

I'm currently working with an ESP32-S3 and an external GSM modem (A7670G) connected via UART. I've set up the connection using the following next:
dial ATD*99#
self.ppp = network.PPP(self.uart)
self.ppp.active(True)
self.ppp.connect()
self.ppp.ifconfig()
counter = 0
while not self.is_ppp_connected():
sleep(1)

Everything works almost as expected; however, I've noticed that my REST calls (using requests) are taking around 10-15 seconds to complete, which seems unusually slow.

I suspect the issue might be related to the LwIP stack, but I'm not entirely sure. Is there a need to configure anything in the ESP-IDF specifically for PPP to optimize this?
Has anyone else encountered similar issues or have any suggestions on how to resolve this? Any advice would be greatly appreciated!

MPY: v1.24.0
IDF: v5.2.2