Wear and tear is a thing, yes. Also, the more stuff you put on your computer, the more it slows it down, yes. However, there is also the fact that generally each update to the operating system is generally larger and more resource intensive to run than the previous. This is because computers increasingly get more and more powerful and thus, can handle the larger and more resource demanding OS. Of course, the computer you purchased doesn’t increasingly get more powerful.
Graphics card is struggling. Make sure you’re not running anything intensive in the background that you forgot about. You could get a hardware monitor and check your GPU stats (temperature, usage, fan speed in case a fan died, etc) before and during gameplay. Also check you have good ventilation for your laptop. They overheat more easily than desktops.
Your PC is a rubber car wheel, the longer it is on the road, the more it wears out.
The weel will continue to move slower as time goes on, but on top of that, you keep adding (programs) weight to the car, which makes it heavier and slower.
Not just that, but you should also worry about (viruses) rocks on the road that may pierce the rubber and make you blow a tire.
Eventually, all cars are too old to drive, its a part of the natural cycle.
Over time as you add more and more software to a computer you end up with increasing background services. If you ever encountered the term ‘daemon’ then this is an example of such. Bootstrap is another term associated with these.
These are (usually) small pieces of code that run at startup, often launchers for larger applications. (Steam is a good example, it might not fully open on startup, but it’s daemon does. Antivirus software is another common example)
You can view these on Windows OS via ctrl-alt-delete and the right-most tab labelled ‘services’. It is worth noting that a range of malware and assorted junk software commonly add such startup processes. Additionally if you buy a machine with preinstalled OS then there may be a variety of software installed that you ultimately do not need yet clutters this list.
So as the number of these background services increases, the ‘idle’ load on your CPU and memory increases, leading to lowered resources and therefore performance.
Be wary purging background services via the above mentioned list, the operating system itself adds a number which are more or less needed. You want to positively identify anything before ending it.
It is good practice to occasionally do a clean reinstall of your operating system. Either from scratch or from an image created shortly after such an install.
Edit: this became less ELI5 and more Eli adult but not tech-savvy. I’ll leave it as such, is hard to avoid with IT
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