I use a 2012 MacBook Pro at work and my supervisor is buying an SSD to replace the HDD - this will make the machine much faster. Have you considered swapping the HDD for an SSD? That would speed up the machine significantly.I have a 2012 but running OS Mojave but its slow booting up it has 8GB RAM. Is there a way I can put it back to its original OSX or Mac it boot up faster please.?
The bottleneck is the old spinner (HDD) on that machine. Swap that for an SSD and you'll see a considerable speed increase. Your MBA has an SSD, that is why you're noticing such a difference.Thanks , I've considered this but the reason I haven't really changed it is I use a MacBook Air mainly and didn't realise how slow the boot up on this was tbh