Super slow when debugging with a device with ART

As i was debugging an android app on my nexus 5 i found that its super slow in nexus 5 but really fast on other mobile, turns out if you have ART enabled (kitkat+) the device cannot ensure the compiled matches the bytecode instructions. From stackoverflow.com they recommended to switch back to dalvik. Thats a bummer for in L ART is the only runtime, i hope they fix this in the future.