Maybe you could update your browsers and download an app that could speed up your internet. It could also be a great s***estion to upgrade your internet into a higher MBPs.
Is it for the whole day or sometime during the day and goes back to its normal speed? If your router is teh problem then you could contact the dealer and could change it to a more higher MBPs.
A good internet speed that probably cost an extra few cents is the difference between enjoying surfing and being frustrated