esp32-cam module how fast of jpeg compression

[xubo92]

@me-no-dev @WangYuxin-esp

I've been testing JPEG encoding recently and I've noticed that the frame2jpg() function takes a bit longer than I expected. In QVGA/RGB565 mode using an OV2640 camera, it takes around 125ms to compress an image. In QVGA/GRAYSCALE mode, it takes about 46ms, and in QVGA/YUV422 mode, it takes 158ms. I'm wondering if these speeds are slower than usual (from this topic: #510). and if there are any ways to optimize the process. Currently, I'm using the default SDK configuration found here: https://github.com/espressif/esp-iot-solution/blob/master/examples/camera/pic_server/sdkconfig.defaults#L3.

Note I use an ESP32-CAM (ESP32-S) module, and run under 240MHz clock speed.

Thank you!

the main code is:

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