Snow leopard is Slow

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If by "fresh" installation, you mean you simply erase and installed, that means you probably have a hardware issue. I have a white iMac Intel Core2Duo that functions just fine under Snow Leopard, and is faster than Leopard.
The installation only took an hour. Run the hardware test that came with your machine. Also did you have third party peripherals hooked up when you installed? That could have slowed things down.

Greetings,

It shouldn't have taken more than 50 minutes from the time the Install DVD was inserted until you made the final boot in to Snow Leopard. My 5 Macs took near that, but not over.

You should have disconnected any external hard drives, and any other peripherals that were connected to the computer, if any.

I always do a maintenance clean up, and run a Repair Permissions - before and after a major install of any kind. I also stop any third party apps from running from the Login Items in the Account settings - you know, the common sense stuff.

I've been an Apple Computer user since the late 70's, , and the Mac's in the early 80's, and I've never had any real issues of note, especially one like yours. Of course, there wasn't that much to updating back then.

No, you had some kind of problem for it to take that long - any more than an hour would be too long. If you didn't have hardware connected to the computer, then it's those dreaded third party apps, and utilities, that one really doesn't need......... 🙂

Cheers,
M.
***

I also have a very noticeable degradation in performance. My upgrade seemed to have gone fine and only took about an hour or two, but I definitely suffer from these "delays" you describe.
Practically any action I take hesitates for about a half-second or more before responding.
Bouncing apps in the dock freeze, then continue in mid-bounce several times before settling...
I've checked my activity monitor and no runaway processes (CPU is over 80% free during these hiccup events and it never spikes when they happen).
EyeTv 3.12 used to play live TV just fine, but now, it stutters and chokes every second or two - completely unwatchable.
Funny thing is that VmWare Fusion runs better now - VMs boot & run better than before...
iChat (video chat) now refuses to make a connection - network timeout after 10 seconds error now on every attempt.
I repaired disk permissions to no avail and have over 50% HDD space free.
Anybody have any luck solving these issues yet? I haven't had the free time to wait on hold for support yet, but might give a try tomorrow.

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I have been running SL for months now, and I must say, this is the most stable OS upgrade I have ever used. It is also the biggest gain in speed I have ever experienced.

That said, an 18 hour install is pretty strange. You may want to consider redoing the install. If it were me, I would erase the drive, reinstall SL, then Migrate with your Leopard backup.

I am having same problem...am seeking solution. I'm noticing this on both my 2008 iMac and 2 MacBooks from late '08 to early '09...

Toran,
Please start a new topic thread here if you don't have solutions for Marc Yang:

http://discussions.apple.com/forum.jspa?forumID=1339&start=0

You'll get a wider audience, and won't confuse Marc with solutions that don't apply to them.

Trying to solve slow Snow Leopard performance (and Safari)I followed a link, I used Font Book and Resolve Duplicates. I found some duplicates and fix that.
The speed WAS IMPROVED although not what I expected.

My MacBook Pro suddenly got extremely sluggish--I ran Tech Tool Pro and found errors in the Catalog B Tree. Same thing the next day, so I took it into the Apple Genius Bar. They said I needed a new hard drive (though my computer is only 15 mos. old). I have Apple Care, so they did it free and I had the computer back in less than 24 hours, and everything is now as it used to be. I'm sure this isn't the answer for everyone, but I was surprised, because I thought at most that they might reinstall the operating system. Along with the hard drive, they did reinstall the 10.6.2 system software for me and then I restored everything else from a backup I had. It's really like having my new computer back.

.. try running repair permissions.. then reboot.