title: Performance and number of links between tables
body: <p>My current schema is getting bigger and bigger, with more than 30 tables and hundreds of links between them. </p>
  
  <p>In other words, every table has three or four foreign keys. </p>
  
  <p>My questions is: does this high number of links has an impact on performance? </p>
  
  <p>Can you give an example on why?</p>