[comp.sys.mac.programmer] trap efficiency : explain?

kearns@read.columbia.edu (Steve Kearns) (06/07/88)

I have seen in several recent letters the suggestion 
"get the trap address..... and call it directly".
The implication here is that calling through a trap is inefficient.
How inefficient?  

(I do not understand microseconds, so please give me the time
 in multiples of a "normal" JSR)

 Thanks,
 -steve
 kearns@cs.columbia.edu