There are many of us that have made computers our life, there is nearly no work that we ca finish without the help of computers. There are official matters, even personal work too that might be at a halt if your system is not working well. If you are troubled with the systems speed then it is better to find out a solution to increase your PCs performance, simply getting a new PC wont be the best way to solve this problem.
There are a few steps that can be followed and verified if they work or not, well in approximately all the cases these steps are the best solution to handle any problem.
Firstly, check out the PC and see what kind of files you have stored in your PC, are there any such files that you do not want and have installed without any proper use. There are chances that at times such files that are if no use, then even they can also reduce the speed of your computer. If there are such files that you do not use then there is no point keeping these files in your computer the best way is to remove them. This might be a good step in increasing your systems speed.
Secondly, check out the defragmentation that you have done. If you havent defragmented your drives properly then there are chances that there might be an adverse effect o the speed and the performance of your PC. There are chances that your hard drive may turn over crowded and this can slow down your PC searches and performance thus defragmentation is needed to overcome such situation.
Get a proper and more RAM, this is required as RAM is the main aspect that allows the smooth functioning of a computer and thus affects the working d speed. The affect of RAM on performance and speed is well known so its better to get more and quite effective RAM.
Graphics, there are at times chances that this factor might be the culprit behind the reduced speed affects. There are times when any game or any functioning turns slow just because of the graphic that are not appropriate in your computer according to the necessary requirement so getting the best graphic card even checking the graphic property can do the needful.