See if anything in here helps: http://helpx.adobe.com/acrobat/kb/hi-dpi-retina-display-support.html
Regarding the slowness, please tell us your operating system.
See if anything in here helps: http://helpx.adobe.com/acrobat/kb/hi-dpi-retina-display-support.html
Regarding the slowness, please tell us your operating system.