Added note about how bad "slow" is

Author: azonenberg

release-notes/v0.1.md

@@ -26,7 +26,7 @@ We have not tested on ARM Windows or Linux, or Linux distros not listed as suppo
 Check the PDF or online user manual for details on driver feature limitations, which drivers support each model, etc.
 
 A "slow" marking indicates that the device is supported, but known to have poor performance due to instrument firmware
-limitations.
+limitations. (Many benchtop scopes, even relatively high end ones, are not well optimized for remote control. Delays of hundreds of milliseconds between the trigger and the API reporting availability of data, and multiple seconds to actually download waveform data, are not uncommon on entry level instruments)
 
 Quick summary of known working models (other similar ones may work but are not tested):
 * Agilent: DSO5000, DSO6000/MSO6000, DSOX1200, MSOX-2000, MSOX-3000, MSOX-3000T (slow)