1C version 7.7 and 8.3 freezes for users, how to find out the reason?

Question

1C

In the accounting department, accountants always freeze 1C versions 7.7 and 8.3, the program is slow. The Internet in the office is in fact fast, no one complains that the Internet slows down, but 1C works very slowly, the computers on which 1C is installed are not weak. Tell me how you can test the 1C system and find out the reason?