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There are some ways to improve the performance of your Mac. Remember, this will not do a significant improvement however it should make the Mac usable. These are very easy to do. Just follow the steps.
First reset the PRAM and NVRAM of your Mac. Follow the steps below to reset the PRAM and NVRAM
Shut down your Mac
Restart and immediately hold down Command-Option-P-R keys at the same time
Hold the keys down until the computer restarts and you hear the startup sound for two or three times.
Release the keys and let the Mac bootup.
Then restart your Mac and immediately hold down Shift key on your keyboard for 15 seconds and this will boot into Safe Mode. Then go to Applications > Utilities folder and open Disk Utility. In Disk Utility, select your hard disk in left column (the first one in the list will be your hard disk), then Repair Permission. After that click Verify Disk and if asked to repair, click Repair Disk. This will repair some files on your Mac.
After that, just restart your Mac normally.
If you are using 10.6 or later version of OS X, then you can download another browser like Firefox or Chrome and use it instead of Safari if you are facing issues with Safari.
Download Firefox from here --> https://www.mozilla.org/en-US/firefox/new/
Download Chrome from here --> https://www.google.com/chrome/browser/desktop/
Please let me know if that didn't work, so we can continue troubleshooting.