Well, according to the article Kermit's performance problems have been fixed :)
"Although ZModem came out a few years before Kermit had its performance optimizations, by about 1993 Kermit was on par or faster than ZModem."
"Although ZModem came out a few years before Kermit had its performance optimizations, by about 1993 Kermit was on par or faster than ZModem."
But most Kermit protocols in terminal software implemented only the most basic version of the protocol and didn't support all the options that you needed to set.
Not sure about resuming, which was AFAICT only a ZModem thing (and the best part of it).