Can an Old Computer Be Made Faster?
Often, yes — an SSD and extra RAM can make a genuinely old computer feel dramatically more usable, often for less than the cost of a new one. The main limit is the processor, which can't be upgraded on most computers and eventually becomes the bottleneck regardless of storage or memory.
What upgrading typically fixes
Storage and memory upgrades address the most common causes of an old computer feeling slow, and both are usually straightforward to do. Many computers five to eight years old still have plenty of useful life left once these two things are addressed.
Where upgrading stops helping
The processor is generally not upgradeable, and on a genuinely old computer it eventually becomes the limiting factor no matter what else is improved. If a computer already has an SSD and enough RAM and is still struggling, that's usually a sign it's reaching the end of what upgrades can fix.