Understood.. There are three areas in which I would like to focus repairs..
repairing permissions. ( this should help speed up the mac slightly )
Resetting Safari.. ( this will help clear up any conflicts in your cache, or cookies that may be slowing down your web experience )
And also, running an antivirus sweep for good measure..
Heres how to repair permissions.
To open Disk Utility, from the Applications folder, open Utilities, and then double-click the Disk Utility icon.
In the column on the left, click your startup disk.
Click the First Aid tab, and then click Repair Disk Permissions. Disk Utility will reset any files and folders with incorrect settings.
Then, do the following
Choose System Preferences from the Apple Menu.
Choose Software Update from the View menu.
Click Update Now.
Select the items you want to install, then click Install.
Enter an Admin user name and password.
After the update is complete, restart the mac
Then, its time to repair safari..http://support.apple.com/kb/ph5043
Make sure you clear the cache, cookies, and reset it..
Then, for good measure.. Run a virus scan
Here is a free virus scanner for mac
If it finds anything serious.. I would strongly recommend purchasing a Mac antivirus program such as http://buy-static.norton.com/norton/ps/2up_us_en_navnis_mac.html?om_sem_cid=hho_sem_sy:us:ggl:en:e|kw0000013860|20157658036&country=US
if you get stuck, or have any further questions, let me know.
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