Hello,

I'm new to the forum so I would like to take this opportunity and say "Hi" to everyone.

I'm using Qt for several years now but I'm fairly new to Qwt.

At the moment I'm evaluating if it's worth moving to Qwt 6.0.1 from 5.2.0.
6.0.1 has many new and interesting features but there's a problem.
I was able to plot 2 million points in less than 1500ms but after moving to 6.0.1 the same operation takes 5000ms+!

Quick look at what's going on revealed that using QPainter:drawPolyline() in the float version seems to kill the performance (forcing qwt to use int version takes 2000ms to plot 2 million points).

Is there a way to switch qwt to use integers?
I think I know the answer, so I'll follow up with another question - why qwt is using now floats when the performance is so much poorer?

Is there anything I could do to improve the performance (except messing with qwt source)?

Best Regards!