CDC boolean operator speed issue

While looking for a slow USB CDC connection (~30-40kB/s) I found that there is an artifical delay in the boolean operator:
https://github.com/arduino/ArduinoCore-sam/blob/c893c62ec9953ed36a256b5243272fda2e473c14/cores/arduino/USB/CDC.cpp#L314

I can not find a reasoning for this delay. Removing it from the source greatly improved USB Speed for me to about 140kB/s

```
void setup() {
// put your setup code here, to run once:
SerialUSB.begin(2000000) ;
}

byte buffer[512] ;

void loop() {

#if 1
int pos = 0 ;
if (!SerialUSB)
return ;
while (SerialUSB.available())
{
if (pos >= sizeof(buffer))
return ;
buffer[pos++] = SerialUSB.read();
}
if (pos)
SerialUSB.write(buffer, pos);
return ;
#endif
}
```

Does anyone know the reasoning behind this delay?

Thanks in advance,
Tim

Inspect cores/arduino/USB/CDC.cpp at the linked boolean operator delay and trace why it is present. Reproduce the USB CDC throughput example, compare behavior with and without the delay, and confirm whether removing it preserves the expected CDC behavior while improving throughput.

Written by the indexing model from the issue text.