How to speed up your computer ?

Optimize Windows for better performance

Try the Performance troubleshooter

The Performance troubleshooter checks issues that might slow down your computer's performance, such as how many users are currently logged on to the computer and whether multiple programs are running at the same time.

Open the Performance troubleshooter by clicking the Start button , and then clicking Control Panel. In the search box, typetroubleshooter, and then click Troubleshooting. Under System and Security, click Check for performance issues.

Delete programs you never use

Uninstall unwanted programs. some of the programs causes malware or virus which you have installed from internet. so, better uninstall programs.

To uninstall or change a program

1. Open Programs and Features by clicking the Start button , clicking Control Panel, clicking Programs, and then clickingPrograms and Features.
2. Select a program, and then click Uninstall. Some programs include the option to change or repair the program in addition to uninstalling it, but many simply offer the option to uninstall. To change a program, click Change or Repair.  If you're prompted for an administrator password or confirmation, type the password or provide confirmation.

Limit how many programs run at startup

Decide for yourself if you want a program to run at startup.

You can find it here.

Defragment your hard disk

To defragment your hard disk

1. Open Disk Defragmenter by clicking the Start button . In the search box, type Disk Defragmenter, and then, in the list of results, click Disk Defragmenter.
2. Under Current status, select the disk you want to defragment.
3. To determine if the disk needs to be defragmented or not, click Analyze disk.  If you're prompted for an administrator password or confirmation, type the password or provide confirmation.
   Once Windows is finished analyzing the disk, you can check the percentage of fragmentation on the disk in the Last Runcolumn. If the number is above 10%, you should defragment the disk.
4. Click Defragment disk.  If you're prompted for an administrator password or confirmation, type the password or provide confirmation.

Disk Defragmenter might take from several minutes to a few hours to finish, depending on the size and degree of fragmentation of your hard disk. You can still use your computer during the defragmentation process.

Clean up your hard disk

If you want to reduce the number of unnecessary files on your hard disk to free up disk space and help your computer run faster, use Disk Cleanup. It removes temporary files, empties the Recycle Bin, and removes a variety of system files and other items that you no longer need.

To delete files using Disk Cleanup

The following procedure cleans up files associated with your user account. You can also use Disk Cleanup to clean up all the files on your computer.

1. Open Disk Cleanup by clicking the Start button . In the search box, type Disk Cleanup, and then, in the list of results, click Disk Cleanup.
2. In the Drives list, click the hard disk drive that you want to clean up, and then click OK.
3. In the Disk Cleanup dialog box, on the Disk Cleanup tab, select the check boxes for the file types that you want to delete, and then click OK.
4. In the message that appears, click Delete files.

Run fewer programs at the same time

Sometimes changing your computing behavior can have a big impact on your PC's performance. If you're the type of computer user who likes to keep eight programs and a dozen browser windows open at once—all while sending instant messages to your friends—don't be surprised if your PC bogs down. Keeping a lot of e‑mail messages open can also use up memory.

If you find your PC slowing down, ask yourself if you really need to keep all your programs and windows open at once. Find a better way to remind yourself to reply to e‑mail messages rather than keeping all of them open.

Make sure you're only running one antivirus program. Running more than one antivirus program can also slow down your computer. Fortunately, if you're running more than one antivirus program, Action Center notifies you and can help you fix the problem.

Turn off visual effects

If Windows is running slowly, you can speed it up by disabling some of its visual effects. It comes down to appearance versus performance. Would you rather have Windows run faster or look prettier? If your PC is fast enough, you don't have to make this tradeoff, but if your computer is just barely powerful enough for Windows 7, it can be useful to scale back on the visual bells and whistles.

To adjust all visual effects for best performance:

1. Open Performance Information and Tools by clicking the Start button , and then clicking Control Panel. In the search box, type Performance Information and Tools, and then, in the list of results, click Performance Information and Tools.
2. Click Adjust visual effects.  If you're prompted for an administrator password or confirmation, type the password or provide confirmation.
3. Click the Visual Effects tab, click Adjust for best performance, and then click OK. (For a less drastic option, select Let Windows choose what’s best for my computer.)

Restart regularly

This tip is simple. Restart your PC at least once a week, especially if you use it a lot. Restarting a PC is a good way to clear out its memory and ensure that any errant processes and services that started running get shut down.

Restarting closes all the software running on your PC—not only the programs you see running on the taskbar, but also dozens of services that might have been started by various programs and never stopped. Restarting can fix mysterious performance problems when the exact cause is hard to pinpoint.

Turn ready boost on or off for a storage device

To turn ReadyBoost on or off

1. Plug a flash drive or flash memory card into your computer.
2. In the Autoplay dialog box, under General options, click Speed up my system.
3. In the Properties dialog box, click the ReadyBoost tab, and then do one of the following:
   • To turn ReadyBoost off, click Do not use this device.
   • To use the maximum available space on the flash drive or memory card for ReadyBoost , click Dedicate this device to ReadyBoost. Windows will leave any files already stored on the device, but it'll use the rest to boost your system speed.
   • To use less than the maximum available space on the device for ReadyBoost , click Use this device, and then move the slider to choose the amount of available space on the device you want to use.
4. Click OK.

   

   Move the slider to choose how much space you want to designate for boosting your system speed.

Check for viruses and spyware

If your PC is running slowly, it's possible that it's infected with a virus or spyware. This is not as common as the other problems, but it's something to consider. Before you worry too much, check your PC using antispyware and antivirus programs.

A common symptom of a virus is a much slower-than-normal computer performance. Other signs include unexpected messages that pop up on your PC, programs that start automatically, or the sound of your hard disk constantly working.

Spyware is a type of program that's installed, usually without your knowledge, to watch your activity on the Internet. You can check for spyware with Windows Defender or other antispyware programs. 

Check your computer's speed

If you try these tips and your computer is still too slow, you might need a new PC or some hardware upgrades, such as a new hard disk or faster video card. There's no need to guess the speed of your computer, however. Windows provides a way to check and rate your PC's speed with a tool called the Windows Experience Index.

The Windows Experience Index rates your computer on five key components and gives you a number for each, as well as an overall base score. This base score is only as good as your worst-performing component subscore.

Base scores currently range from 1 to 7.9. If your PC is rated lower than 2 or 3, it might be time to consider a new PC, depending on what tasks you want to do with your computer.

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