Linq to Entities : Count is very slow

I need to have parent and parent.child.count()....in the query.. when i do this it is taking 20 seconds....its not a huge database...Any ideas for optimization...

var plist = context.persons
  .Select(p => new
  {
    p.fullName,
    c.personID,
    p.Status,
    p.Birthdate,
    p.Accounts.Count
  }).ToList();