MacBook laptops have become indispensable tools for both personal and professional use. However, like any electronic device, MacBooks are not immune to malfunctions, wear and tear, or unexpected...
This is probably not so much a problem with macbooks as with all devices and all computers. The older they get, the worse they work due to various factors. And there are also trivial reasons like not enough RAM and too many files and applications. You can learn more about this and other reasons here https://setapp.com/how-to/how-to-speed-up-a-slow-mac. If you have one of these reasons, you can solve everything quite quickly, even without giving the laptop to a repair service.