1) Too many programs are running at the same time.
It is common for users to download utilities, applications, and other programs that run in the background. The more programs that are running – whether you see them or not – the less memory your computer has to do other things you are asking it to do.

Avoid downloading web browser-helpers, more than one anti-malware program, or applications that claim to “speed up” your internet or your computer, as each one added will slow down your performance.

 2) There’s not enough free RAM.
Random-access memory (RAM) is what your computer uses for temporary working and thinking space. The more programs running at a time, the more RAM is used. If your computer is running slowly, it could be because too many programs are running, and you don’t have enough RAM. To make your computer run faster, run fewer programs at a time or increase your RAM.

3) You have a virus/malware infection.
Internet slowdowns and slow computer operation can be a symptom of an infection. To find out if you have a malware problem, use an anti-virus and anti-spyware application to find it.

4) Dust in the cooling fans
Dust accumulates over time. As your computer draws air in to cool the various components, it draws in other things, like dust, hair, rug fibers, etc. We have seen it packed in the cooling fans so tightly that the fans couldn’t turn and burned out. Dust can also short between contacts on circuit boards, clog optical drives, and reduce the cooling effectiveness of CPU heat sinks. Heat not only shortens the life of your components, it also triggers a significant reduction in CPU speeds.

5) You have low hard drive space.
Lack of hard drive space often affects older computers, or computers that do a lot of video editing or design work. Hard drives, which store all of your computer’s information, have a finite amount of space. Once they’re filled up, the computer no longer has the ability to manipulate files. The computer will slow down, eventually becoming unusable.

Generally, Windows will alert you to “low disk space” if this is the case. Moving some of your less-used files — such as pictures, music, and movies — to an external hard drive would free up some of your computer’s hard drive space and make it run faster. Deleting temporary files and performing a disk cleanup are also good ways to reclaim wasted space. Another solution? Install a bigger hard drive.

6) Sharing a wireless network.
If your internet is running slowly, but your computer is running quickly, you could have a lot of activity on your wireless network. Check to see if anyone else on your network is doing something that uses a lot of bandwidth (like streaming video or playing online games), as this can make your computer run slowly. You should also make sure your wireless network is secure so someone else isn’t using your Internet bandwidth. If your wireless network is not secure, we recommend you create a password to secure your data and ensure strangers don’t join your network.

7)  Too many “bells and whistles.”
Animated pointers and hi-resolution images of your favorite vacation spot may look nice, but they can also slow your computer down. Since animations and images load into memory every time you start your PC, there is less processing power available for more important tasks.

8) You have a scanning program running.
When a scanning program such as an anti-virus, anti-spyware, or automatic backup is running, your computer may respond slowly. We don’t recommend disabling these, as they are an important part of your computers safety. These programs should be run at least once a week, but don’t plan on using your machine while they are running.

9) Your computer barely meets your software’s minimum requirements.
Software usually has a list of requirements for things like processor speed, operating system, memory (RAM) and hard drive space. These specifications are the absolute minimum levels needed to make the software run. If your computer just meets the requirements, the software will run, but it might not run well. Try to meet or surpass the system “recommendations” of your software, rather than just meeting the bare requirements.

10) You have a fragmented hard drive.
It’s important to defragment your hard drive to help the computer organize itself better and make sure it runs smoothly.