I installed ubuntu a few years ago. In the first days it was very fast compared to windows. However it goes slower by time. It takes more than 1 minute to see the desktop. Chrome takes around 30 seconds for cold start. Atom editor is also same. Also it would take around 4-5 seconds for ubuntu to shut down. Now it takes around 15 seconds. Sometimes it doesn't shutdown at all. It just shows the closing screen and stays in that state indefinitely.
It seems that the new Windows 10 is much more faster than ubuntu. How can I speed up my ubuntu? And why ubuntu isn't faster than windows anymore? I think linux should also use some kind of hibernation like windows do.
Edit: my cpu is intel i7 2.2 GHz. It has turbo mode but afaik linux cannot use that mode. I have 8 GB ram. So it is not due to my hardware.