Internet may be slow due to the following reasons.
Here a few tips to speed up.
1. Upgrade your Internet Plan
2. Control Bandwidth Usage
3. Free-Up Temporary Directories
4. Optimize your Internet Settings
5. Update Microsoft Silverlight.
I can advise you to download this software,
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it might be that your internet service provider is the problem
it might be that your network interface card is not functioning well so try to disable/enable it or uninstall and install the hardware
It might be that you have problems with your operating system, especially if you experience slow speed after software installation
It might be that the port where your ISP connected your line is saturated
It might be there are updates running in your computer that you are not aware of
it might be that you have spywares, malwares or maybe virus
these spywares can really consume a lot of your bandwidth
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