10.4.6 Combo Update has slowed my iMac G5

Hi,
Ever since I installed the Mac OS X 10.4.6 Combo Update, my iMac G5 (Rev B) seems to be running very slow!! For e.g., when I restart my Mac, the grey spinning ball appears on the blue background for 20-25 minutes.
Additional info: I generally connect a 200 GB Seagate HDD via USB to my Mac.
I have repaired permissions but no help!!
Any other "speed-up" tips?
Please advise,
Thanks in Advance,
Suddha

Some of these steps are of questionable value. Erase w/zero is a security function & applies to volumes, not drives. As such, it doesn't "zero" the drive in any special way, nor are zeros in volume data any safer than any other data pattern if file system errors occur.
If you really want to start fresh, select the Partition option in Disk Utility & reformat it with the "Partition" button. This will rewrite the boot partition info, partition scheme, etc. Be sure to check the "Option" button to make sure you choose the scheme appropriate for your Mac, in this case Apple Partition Map.
It is not necessary to keep your startup drive below 50% usage for good performance. There is some small advantage to keeping individual, very large files (such as video clips of several GB or more) on another drive, but in general, as long as 10-15% or at least 5-7 GB are free on the boot drive, there is little to be gained from a performance standpoint by freeing up more space on it.
The same is true of the clone/reclone step, which is a way to defragment a volume. Tiger does this by itself for smaller files, so unless you have a lot of the large ones mentioned above on the drive, you won't see much if any improvement in responsiveness, particularly with a fast SATA drive like in your iMac.
In this case, the cache cleaning & related steps in Onyx or a similar utility will probably do what you want, together with trashing any prefs for apps that continue to be sluggish & avoiding any login items from third party sources until you get things humming along smoothly.
It is better to try one thing at a time & see if it makes any difference rather than trying the "shotgun" approach, since pinpointing the source of the problem is the best way to prevent it from reoccurring.

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