This goes to anybody who stumbles upon same issue. 

I ended disabling line updating through setPos method in mousemoved event. 
Instead I update line position only at data update events, which happen 10 
times per second in my case, which is fast enough for me.

On Monday, March 13, 2017 at 5:20:27 PM UTC+1, [email protected] wrote:
>
> Hi Nicholas,
>
> I don't know if I'll get a reply, but I would really like to know if you 
> solved the issue. I am having same problems, and there is not much info 
> available on the issue.
>
> On Tuesday, June 3, 2014 at 11:50:28 PM UTC+2, nicolas commaux wrote:
>>
>> Hi Michael.
>> That's what I did. I declared the infiniteline under an alias and then 
>> added the item.
>> Then I call the setpos method through the alias to change their position 
>> in the slot triggered by the sigmousemoved event (through a proxy limited 
>> to 15 updates a second not to generate too many events).
>> but it is very slow (an update of the crosshair maybe every second).
>> So that's probably not the trick.
>> I reattach the python files in case you want to ahve a look at them
>> Thanks
>>
>>>

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