Unity Speed Issue on a Macbook

I have a Macbook with Nvidia Geforce 9400M graphic card.

When running a unity project in Editor mode, it slows down after 1 mintue or also. For example, the frame rate will drop down after 1 or 2 minutes running.The speed keeps slow unless I restart my computer.

Any suggestion about this?

Thanks.

It sounds like you may have inadvertently created a memory leak withing your project. Try using the profiling tool and check where the leak is coming from.