Gamers and some people who use their laptops rigorously might have noticed that their laptop becomes too hot on intensive usage. The main reason of heating laptop or processor is its continuos use at maximum efficiency i.e. 100%. If you are exhausting your CPU for a long time at its maximum capacity, it is definitely going to reduce its lifespan.
You can understand this simply as suppose you have capacity to lift weight up to 80 kg. It doesn't mean that you can always keep running by holding that load. But for sure you can, with some reduced weight of the load.
The same logic applies here. So, if you limit processor's efficiency to below 100, it can keep going for a long time. But you have to compromise with its speed in the according ratio. This will also help you to prevent your system from heating.
How to Limit CPU Efficiency?
Go to Power Options from the Control Panel or by clicking the power icon in system tray.
Now click on Change Plan Settings in front of your active power plan or to whom you wish to change. In the next screen click on Change Advanced Power Settings link. Now a new small window will open.
In that small window, expand Processor Power management -> Maximum processor state, and reduce the On battery and Plugged in power settings. Reduction of On Battery value will also reflect battery consumption.
No doubt its your computer and you can set any value lying from 0 to 100%, but make a balance so that neither your processor get harmed nor its performance. For a normal computer I advice to keep this value in between 90-98%.