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Why linux os does not need refresh ? And I have also heard that windows gets slow with time in comparison to linux.
Is there any truth in that and why ?

Linux has no registry.
No AV startup in startup.
No phone home in startup (mostly).

No extra installed stuff in the registry left behind by a clueless user.
http://www.zdnet.com/blog/hardware/w...r-fiction/3325

linux get updates as well, just it is much simpler (in most cases you do not need to reboot). I do not know why windows gets slow with time (yes, I know, it can), but I think it may depend on the usage, the user itself. Linux behaves differently... and it can be kicked out too.

Do you mean by 'refresh' option in Linux? Or looking for similar option of 'refresh' in Linux like we've in Windows? If yes, then Windows has two way of refresh. First, when you right click on desktop and choose refresh, it will refresh the screen and adjust any changes made on screen. Second, when you refresh in window explorer or IE, then it simply re-read the data or reloads the web pages in IE.
However, you can find the refresh option in Linux as well. But it all depends upon desktop environment. It has a different way to use i.e. Linux refreshes itself or there's command names xrefresh (see link below). On the other hand, for web browsers, there's always an option in address bar for refresh the page.
http://www.cyberciti.biz/tips/howto-...e-desktop.html

When it comes to slowing down - Windows uses the registry which, as you install more applications, gets bigger and bigger so it takes more time for the system to read and extract relevant information from it. Very often if you uninstall programs, they still leave some of their stuff in the registry.

Another reason for slowing down Windows is fragmentation of disk space. Here you can read more about differences in this area between Windows and Linux.

I think it is also more common for Windows programs to install background processes which do things like check for updates periodically (think Adobe Flash for one) so if you install a lot of programs you can end up with lots of background processes hogging processor time etc.
Whereas in Linux most programs only run anything when they are explicitly opened by the user. This being, I think, partly due to most distributions having a single update method for all installed aplications and partly because those who write software for Linux tend to respect the end user's choice to run a program when they want.