Rule of thumb would be to replace your computer when it stops doing what you want it to do in a fast enough time.
I've made my Lenovo Thinkpad X230 feel a lot snappier by replacing the HDD (which are usually only 5400rpm) with an SSD. Having at least 8GB of RAM also helps with making it feel faster.
Decent new laptops have a tendency to run a bit on the pricier side. I found a lot better value in some older ones from the used market, but you have to keep an eye for deals and it depends heavily on your location.
Before going with any more specific advice, it would be really helpful if you could answer the following questions:
What exactly is the model and configuration of your current laptop?
What country do you live in, so that we can get an idea of the prices and the market level?
If you want to replace your machine, what would your budget be?
What sort of work do you use your laptop for? What games do you play on it?
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Rule of thumb would be to replace your computer when it stops doing what you want it to do in a fast enough time.
I've made my Lenovo Thinkpad X230 feel a lot snappier by replacing the HDD (which are usually only 5400rpm) with an SSD. Having at least 8GB of RAM also helps with making it feel faster.
Decent new laptops have a tendency to run a bit on the pricier side. I found a lot better value in some older ones from the used market, but you have to keep an eye for deals and it depends heavily on your location.
Before going with any more specific advice, it would be really helpful if you could answer the following questions: