Laptop is slow, getting hot, take ages to start

I would say its the common problem , after time the laptop if full of unwanted files programs and all sorts.

Probably the cooling fan is blocked and thermal paste is dry.

It needs a service .

What you have to do first is to fix the problem with overheating, get into your laptop and clean all inside , then replace the thermal paste.

Now at least you know that will not overheat itself especially when you need  a lot of time to clean your system and sort the system problems.

Sometimes takes ours to do that.

To run few cleaners and anti-malware takes a time.