Currently Being ModeratedJul 13, 2012 5:26 AM (in response to Lukas Willcocks)
Cocktail may be what is slowing you down. Backup your data at least twice, and erase and install, and restore your system applications from the CDs and downloads of those applications, and data files from your backup. The big mistake is to assume any utility is necessary for a Mac other than a backup utility. System cache files are there to speed your system up. Only if they get corrupted might a utility like Cocktail come handy, but corrupt cache files, and dying hard drives can have similar symptoms. Without isolating hardware versus software, you don't know which is actually happening. Erasing will eliminate any possible hardware issue.
Currently Being ModeratedJul 13, 2012 1:06 PM (in response to Lukas Willcocks)
It is always best to have a full bootable backup before you upgrade. If you fail to do this you will be unable to return to this OS if you decide you don't like the new OS. Also there is a slight chance that an install could lose everything on the Mac. The backup must be to an external hard disk. Preferably use Carbon Copy Cloner to make a bootable backup of the whole disk.
Erase before the install
Once you have a bootable backup on an external disk it is best to erase the internal disk with the new installer DVD before you install.
During the install
Preferably do not import any data or preferences from earlier OSs during the install process as this can reintroduce bugs.
OS numbers and names
OS X 10.4.x - Tiger
OS X 10.5.x - Leopard
OS X 10.6.x - Snow Leopard
OS X 10.7.x - Lion
OS X 10.8.x - Mountain Lion
More about Macs
The Apple History site has specifications for every Mac ever produced: http://www.apple-history.com/
Upgrade to Leopard
Those wishing to upgrade to Leopard should be aware that install disks can be expensive unless you contact Apple. Details: http://lowendmac.com/deals/best-os-x-leopard-prices.html Standard Leopard installers impose several hardware limitations including speed and RAM size but all these restrictions can be overcome. Google for details. Leopard works well at 500 MHz with 1 GB of RAM and many happy users have less than this.
Upgrade beyond Leopard
OSs beyond OS X 10.5.8 require an Intel processor. If in doubt check this: Click the apple at the top left of your screen and select 'About this Mac'. This will give you your OS number. Then click 'More Info' to see which processor you have. If it says PowerPC you cannot upgrade to Snow Leopard and above. If you have an Intel Mac it is well worth upgrading to Snow Leopard now and then considering other options after that. You can buy Snow Leopard here: http://store.apple.com/us/product/MC573Z/A
Upgrade beyond Snow Leopard
Information about upgrading Snow Leopard to Lion or Mountain Lion: http://store.apple.com/us/product/MD256Z/A
Check that your Mac complies with any requirements. If you are not in the US you should use the Change Country link at the bottom of Apple pages.
Currently Being ModeratedJul 13, 2012 2:22 PM (in response to Lukas Willcocks)
Check the S.M.A.R.T. status of the drive in Disk Utilty by highlighting the Drive & looking at the bottom of the window.
Open Activity Monitor in Applications>Utilities, select All Processes & sort on CPU%, any indications there?
Open Console in Utilities & see if there are any clues or repeating messages when this happens.
How much RAM & free space do you have also, click on the Memory & Disk Usage Tabs.
In the Memory tab, are there a lot of Pageouts?
Currently Being ModeratedJul 14, 2012 7:09 AM (in response to Lukas Willcocks)
Running Onyx while Safari, or any other program is open, is not wise. Caches are written by the operating system and other programs active. If you have something else try to delete them while they are open, that can cause corruption.
Currently Being ModeratedJul 14, 2012 7:15 AM (in response to Lukas Willcocks)
Note you should click on the Kind tab to see if there are any other PowerPC applications grouped together as well. Anything that runs as PowerPC is not running any faster than a G3 processor speed. There is no Altivec in Rosetta.