diff --git a/docs/Benchmarks.md b/docs/Benchmarks.md
index d62a47f2..a29e1892 100644
--- a/docs/Benchmarks.md
+++ b/docs/Benchmarks.md
@@ -399,17 +399,20 @@ reported in the two "uptime" response messages. The total number of
 commands per second is then `100000 * mcu_frequency / clock_diff`.
 
 Note that this test may saturate the USB/CPU capacity of a Raspberry
-Pi. The benchmarks below are with console.py running on a desktop
-class machine with the device connected via a high-speed hub.
+Pi. If running on a Raspberry Pi, Beaglebone, or similar host computer
+then increase the delay (eg, `DELAY {clock + 20*freq} get_uptime`).
+Where applicable, the benchmarks below are with console.py running on
+a desktop class machine with the device connected via a high-speed
+hub.
 
 | MCU                 | Rate | Build    | Build compiler      |
 | ------------------- | ---- | -------- | ------------------- |
-| pru (shared memory) |   5K | b161a69e | pru-gcc (GCC) 8.0.0 20170530 (experimental) |
 | stm32f042 (CAN)     |  18K | c105adc8 | arm-none-eabi-gcc (GNU Tools 7-2018-q3-update) 7.3.1 |
 | atmega2560 (serial) |  23K | b161a69e | avr-gcc (GCC) 4.8.1 |
 | sam3x8e (serial)    |  23K | b161a69e | arm-none-eabi-gcc (Fedora 7.1.0-5.fc27) 7.1.0 |
 | at90usb1286 (USB)   |  75K | 01d2183f | avr-gcc (GCC) 5.4.0 |
 | samd21 (USB)        | 223K | 01d2183f | arm-none-eabi-gcc (Fedora 7.4.0-1.fc30) 7.4.0 |
+| pru (shared memory) | 260K | c5968a08 | pru-gcc (GCC) 8.0.0 20170530 (experimental) |
 | stm32f103 (USB)     | 355K | 01d2183f | arm-none-eabi-gcc (Fedora 7.4.0-1.fc30) 7.4.0 |
 | sam3x8e (USB)       | 418K | 01d2183f | arm-none-eabi-gcc (Fedora 7.4.0-1.fc30) 7.4.0 |
 | lpc1768 (USB)       | 534K | 01d2183f | arm-none-eabi-gcc (Fedora 7.4.0-1.fc30) 7.4.0 |