Does having an AppleShare connection active throw off timing a bit?

[scott@alfter.DIESPAMMERSDIE.us (Scott Alfter)]

I thought I had seen something in the past that said that if your IIGS is
connected to a server, some cycles would get "stolen" here and there, which
could affect timing-sensitive programs.  Is this the case?  If so, it'd
explain the weirdness described below:

I've been porting my 1-Wire code from a mix of assembly and BASIC (with the
former being built with a native assembler) to a mix of assembly and C
(with both cross-compiled/assembled with cc65).  The Linux box that hosts
cc65 also has netatalk running on it.  I have a IIGS connected to the home
LAN through a GatorBox, with my 1-Wire adapter in the 16-pin joystick port.

The assembly-language bits use timing loops to create the 1-Wire signals,
with delays ranging from 6 μs to 480 μs.  If I'm connected to the file
server, the reset routine (which checks the 1-Wire bus to see if anything's
connected) shoots past its window and says nothing's connected.  If I
comment out that check to get past it, the other routines don't work any
better.  If I slow down from 8 MHz to 1 MHz and hit Ctrl-Reset, the computer
disconnects from the server and the 1-Wire routines start working correctly. 
(Interestingly, I can kick the speed back up to 2.8 or 8 MHz and they'll
still work.  The accesses that the 1-Wire routines make to PB2 (the third
fire-button input on the joystick port) must slow the machine down to 1 MHz
for a bit.)

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