OpenBSD/i386 7.3 on a Macbook 2006

Hello,

I've installed OpenBSD/i386 7.3 on a Macbook 2006.
It works, but the fan is running at maximum all the time.
Is there anything I can do to optimize the system for such machines?

Here's the output from dmesg and "sysctl hw.sensors":
http://paste.debian.net/1278825/

Regards, Martin