following is my version based on what i feel  imagine your brain is a computer which has multiple processes running like imagine your speech hearing doing some action on some trigger all are separate process these processes requires some amount attention of your brain cpu time now imagine ocd as some virus process that consumes big amount of your memory as well as brain power cpu power because of that other critical processes like mentioned above starve for resources   one examples is when i speak in english english not my native language i really feel frequent interruptions as my ocd process continuously consumes my memory and brain power and doesnt allow my speaking process to get enough brain power when needed  another example when i write a code i need to have a good focus consider thinking about some engineer problem and  writing a code to solve that as a process that is cpu bound an requires great amount of computation like matlab doing some number crunching algorithm at that time ocd consumes majority if not all of brain power cpu cycles and my coding process starves this is real scenario happens with me all the time i really struggle to solve tasks assigned to me because of ocd  if you try to kill it almost impossible task it executes itself again or cant be killed virtually if i install some antivirus medicines etc it remains silent for some time and then change itself to resist typical computer virus polymorphic behavior that antivirus and i need to install another antivirus after some time this goes on and on  it has installed itself into the corekernel of my brain so kernel thinks it is essential process and orders system to assign as much cpu and memory as it needs