This is comparation of transfer speeds in different settings


No encryption, no monitoring	: 176 kB/s
Signal monitoring	       	: 174 kB/s		
Encryption			: 142 kB/s
Encryption + Signal monitoring 	: 137 kB/s	

Tested:
Connection between Pentium/75 and 486/40

Testet data transfer with ttcp, 100% signal ratio.
ttcp -t -n500;ttcp -r