Although almost all modern processors are powerful enough to operate without problems more than 80% of applications, the reality is that in certain cases you may be limited by this device that finally and within it is the brain of the system.
You have a little powerful processor and have little RAM can be confused, the way of knowing if you need a better micro is by watching the system and if you are leaps but can’t you see the hard working then is this device.In this case the solution is to change the processor but it may be that for some systems this is impossible and you will not be another option that buying a new computer.
Outdated graphics card.
With the graphics card you can get something similar to the processor, especially if you do use the PC to play or type AutoCAD applications. If the card is out of date you can even have problems opening newer games.
The solution comes as in the two previous cases to buy a new graphics card.
Slow hard disk.
If something has taught us new discs SSD is a bottleneck in any of the items may lead to a system to look like a turtle. These not only disks are several times faster disks normal when we speak of sequential readings but you can find improvements of tens to hundreds of times in the case of random reads and writes that are more usually give PCs.
If you notice that your computer is slow, especially at the start, what you should do is buy a SSD and mounted it to a new operating system. I promise that you will notice as the entire system flies.