I have a Sony Vaio PCG-FRV26 laptop and it has been running slow for the last few years.
Was thinking of buying a new laptop because it was so slow.
Recently it shut down a few times due to overheating so I blew out a big cloud of dust with a can of air.
Now it is running like new.
The fan is quiter and at a lower speed, the laptop is cooler and the performance has come back to like new.
Not sure how this is possible or if something else happened.