Is it necessary to install any applications which help us to speed up our machine?

No, Because this kind of applications are like some kind of magic, they are not showing us the reality, all are hidden process. Actually, we don't need to speed up our machines with this kind of applications. Those applications are actually cleaning garbage/damages in the registry and some unwanted files in the system. So you can do the easily without buying those kind of software in the market by searching "How to speed up my computer" or particular operating system in google search engine. It is also a kind of hacking process but that term is used here for good purpose but some time this kind of works may damage your system files so you have to be aware of this things otherwise don't try it. The basic things which are given in the system tools of your operating system, that is enough for speed up your computer, so don't take time to find a good application to do this process, search in google.com. you can find more tricks and tips to speed up your computer without any problems. but don't try to download apps for this process