Wifi AP very slow when using WPA2

[federicolonghin]

Good morning,
I'm developing a commercial product on esp32s3, it uses lot of peripherals, Uart, two bus on RMT, multiple SPI, I2C, external flash memory, nvs, and lot of tasks.
I developed a webApp hosted on the esp for setting things, so I have the HTTP server running as well as the webSocket Server, and DNS for making the captive portal.
if I leave the wifi network open (WIFI_AUTH_OPEN) everything works fine, but if I use WIFI_AUTH_WPA_WPA2_PSK instead the connection became very slow, requests goes in timeout and it became unusable.
All other tasks has lower priority than the Wifi/webServer ones. I saw also that the IRAM space is fully used

Is it normal? Are there some usable authentication way lighter than WPA2?
thanks in advice.

Using Esp32s3-wroom-1 MCN16R8 with ESP-IDF 5.5.3