Even though the server is running fine, entities and redstone are extremely slow

Put the summary of the bug you're having here

What I expected to happen was the server to run fast

Entities and redstone run slow, but the server response to the client via commands is fine. - It was working fine when we first started the server.

Steps to Reproduce:
1. A lot of redstone machines on a server
2. Using the program MCedit
3. Trying to use redstone machines created