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It sounds to me like it's your internet connection, not the computer itself. You may have to get a faster net connection so you can watch vidoes without the lag.

Hi, you can speed up your computer by the following ways:

1.run a antivirus software to scan your computer fully.

virus usually impacts the speed of computer.

If there is no virus, see the possible reasons that make computers slow down and solutions.

2.Registry is the centre database of your computer operating system which contains information and settings for hardware, operating system software, most non-operating system software, and per-user settings. You must load the registry whenever you launch any programs on your computer. If the registry is too fat or with some errors, computer's performance will seriously be impacted. So, you need to clean up registry and fix its errors.

If you are not familiar with registry, don't remove files away from it and clean up it easily for you may delete important things that will make your computer in trouble. You'd better choose to use a professional registry cleaner,personally,I like wondershare registry optimizer,it's safe to operating system.

3.There must be too many programs start up automatically when you start your computer.Run a registry optimizer or cleaner to stop those unnecessary start-up programs.

4.Have you ever clean up your computer since you bought it? If the answer is never, I am sure that there are lots of junk files on it. Junk files is also one of reasons that will cause computer slowing down. You'd better delete them regularly.

2,3,4 can be realized by a registry optimizer.

5.If a registry optimizer doesn't work, add RAM or do a fresh reinstall of windows. Before you do a reinstall, please remember to back up.However, you should know that frequent reinstall is harm to hard disk.

6.Put programs on other drivers ,not C driver, because commonly C is for operating system. And defrag hard disks every 2 months.

As a matter of fact, there are a lot of methods to speed up your computer, including cleaning up registry or disk defragment.

According to your question, I think you should defragment disk firstly. Since you have performed frequent read-write operations to disk, it is inevitable to produce a a large number of disk fragments in the hard disk.And a file is divided into several pieces. So when system wants to fetch this file, it takes more time to read its different parts completely. In this regard, what you need to do is to rearrange those fragments so that the computer will not have to spend too much time on it.

You can get more information:

http://ezinearticles.com/?Disk-Defragment---Why-I-...

You can use a registry cleaner to clean up your computer and then make your computer faster,Why?the reason is that there may be some registry errors and remnant,corrupt files and temp files in your computer to cause "computer slow".

Every time you install and uninstall software on your computer and surfing online you create junk in the computer registry.over time, the registry can grow to enormous proportions, especially if the various programs you've installed do not do a good job of deleting and/or updating it's Registry entries.You need to scan and clean your computer with registry cleaner to make it fast.Good Registry Cleaner will improve your computer and Internet performance dramatically!

There are some comparison and review of TOP 5 registry cleaners.

http://make-computer-faster.com/

You can download and scan your computer for free.

Go to http://pc-optimizer-pro-downloads.com/

You can safely clean, repair and optimize your computer.

It will help improve your system performance and stop your computer from freezing.