title: MagicalRecord saving takes time
body: <p>i am using magicalrecord in my app to manage coredata, every thing is perfect now but i am having an issue,i created 10k entities using this code: </p>
  
  <pre><code>[MagicalRecord saveWithBlockAndWait:^(NSManagedObjectContext * _Nonnull localContext) {
  
  Person *person = [Person MR_createEntityInContext:localContext];
  person.organization = [Organization MR_findfirstInContext:localContext]; 
  person.name = name;
  person.id  = id;
  person.age = age;
  
  ]};
  </code></pre>
  
  <p>after creating 10k records when i perform any change in database using magicalrecord it gets stuck for 4 or 5 seconds while saving to root context, which makes UI freez no matter if its on main thread or background thread.</p>
  
  <p><strong>Edited:</strong>
  i have found the problem if i remove relation (which is organization) from save block it dont get stuck, if i fetch organization from out side the block and assign in inside the save block it throw an exception that organization is created in different context.</p>