HOTLINE MIAMI SLOW-MOTION/LOW FPS FIX !!!
simply change your windows to any of the default "windows aero themes".
step by step:
right click desktop
left click "personalize" on the bottome of the popup menu
that should take you to a window showing your current desktop/screensaver images, display theme, etc. just scroll down until you see the subsection "aero themes", and select any of the ones from that area.
i had mine set up on the old school classic themes, and for some reason, it was causing Hotline Miami to run at about 1/4 speed. -___-
i saw some other people were habing this problem as well, so i thought id post what worked for me.
my setup for reference:
i7-2700 @3.4 ghz
amd radeon 6990
win 7 premium x64
hope this helps yo
EDIT: try using the default aero theme, titled "windows aero"
EDIT: it should be noted that im playing on a mac, via bootcamp, so maybe this fix is specific to my set-up, or similar set-ups. sorry, if it doesnt work for you guys.