How much tables approximativly in the designer will make Visual Studio slow?

I was wondering if my database got way too much table for use the designer. Would be glad to hear experience from those that using L2Q with lots of tables.

1. How much table your database h开发者_StackOverflowave ?
2. How fast is VB ? (fast, experiencing slowdowns, unusable)

Thanks.

I've got 700+ tables in the dbml file in one project. Works fine. After Adding/Deleting tables from the designer it takes 3-4 seconds to save the file.