Indeed in the last 1 or 2 years the amount of background vehicles in movies has been increased, which caused some problems as not all of us agree on the amount which is acceptable.

Having too much vehicles listed of course affect the performance of the site (database size) and fills the available space more quickly. The site should still be able to grow in the next year but after that I'll probably have to find another solution.

There were discussions in the admin section about what to include or not, this was more or less summarized in the "guidelines" shown on the help page of the site.