Comment 19 for bug 172063

@jazzynico, thanks for testing.
About the performance regression, it happens in long red curves -pen tool- moving fast trought the window. Anyway I work now throught VNC and maybe this is the problem -I think no, because the cursor update his position but...
To me the best scenario is:
x0.92 make a patch for helper lines like the handles one -over blue to view well- but with a bit more transparent the white line. (patch 1)
x0.93 evaluate improve the XOR code, if we can discard performance regression
x0.93 allow configure in preferences dialog the color/transparency of the helper lines on the whole aplication.

I put it on the mailing list. But previously I complete the patch 1 to well test it in all Canvas Items.

Cheers, Jabier.