I had a look at your setup. In my computer I could lower [metro] down to 3ms without issues. At 2ms Pd crashed. One thing to note: upload the following code to your Arduino board:

void setup() {
    Serial.begin(115200);
}

void loop() {
    Serial.write(13);
    delay(500);
}

In Pd connect [comport] to [print]. If Pd prints 13 you should be good to go with the [serial_print] abstraction (and I don't know what's wrong and why your computer crashes, TBH). If Pd prints 10 then you need the [serial_print13] abstraction (it might be counter intuitive that when you don't get 13 printed you need [serial_print13], but that's how I've named them...). In my computer I get a 10 printed, on my Raspberry Pi with a Teensy I get 13. I have no idea why this happens, it seems to depend on the hardware.

Thank you for doing this. It may also be relevant that I experienced the exact same of freeze/crash behavior when using Pduino.

Date: Fri, 9 Apr 2021 17:14:18 +0300
From: Alexandros <adrcki@gmail.com>
To: pd-list@lists.iem.at
... 
This has to do with the abstraction I made then. We did discuss about it
on Pd's forum, but it didn't occur to me that this could be the case.
I'll have a look at it and get back to you.

On 9/4/21 5:10 ?.?., Nicklas Lundberg wrote:
> Hmm, it does not crash when [serial_print any] is disconnected. You
> can quit normally.
>
> This may be relevant:
>
> Pd console reports no errors when communication fails when trying too
> fast updates (with [serial_print any] disconnected less than 30 ms).
>
> I uploaded a similar setup (pd patch+arduino sketch) to the folder.
> Here it does not crash even if updates are sent every 1 ms. And the pd
> console starts to write error messages when the communication is too
> fast (starts around 7 ms).

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