I've been experiencing a mouse-delay issue on experimental 0.61 recently and from what i've heard, many other have aswell. It's an issue that's not currently on stable. (playing with the exact same video and control settings on both versions)
Nothing i tried when changing video and control settings seemed to fix the mouse-delay issue on experimental, except for one thing.
I went to Documents\DayZ and opened the DayZ.cfg file. I noticed that "Render_W" and "Render_H" was set to a much higher resolution than "Resolution_W" and "Resolution_H"
I changed it so it matched my default resolution and then started the game again, and the problem was fixed.
Now the problem is that it's not possible to change the render resolution in-game on experimental 0.61, but it's possible to do on the stable version. Also, sometimes when i quit experimental 0.61 the render resolution changes back to a much higher than my screen resolution, when i go to check the DayZ.cfg file again.
It would be great if the cause of this problem was fixed before the experimental version is pushed to stable. Also re-adding the option to change the render resolution in-game would not harm anyone.
Thanks, Tubleros