I did some tests and the problem is not Modbus itself. It is the GUI. 
Even if I disable Modbus the GUI really slows my machine down.  I would 
guess the main problem is that I have a lot of rungs in my ladder. I 
originally set the ladder up about 18 months ago and I seem to remember 
the GUI being pretty sluggish then as well.

Les

> On 28/03/11 13:30, Stephen Wille Padnos wrote:
>> I haven't looked at the code, but I wonder if there's some busy-waiting
>> or very short duration usleep()s in the serial receive function(s).
>>
>> Do you see the same load if you have CL running without Modbus?
>>
>> - Steve
>


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