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If it doesn't already have an ssd in it then putting one in will make it run like a new computer. Don't bother paying someone to do it, there are loads of guides online how to do it yourself, it's fairly straight forward. I think a 500gb ssd is about £150.
Upgrading ram is also straight forward to do yourself. However it will have much less of a performance improvement. Unless you using multiple intensive programs at the same time then it might not be worth it.
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What @haveo says...
If you have never done it before, it'd probably take you 15mins to watch a video or 2, then maybe 15mins to do it.
I've currently got a mid-2012 13" Non-Retina MacBook Pro with 2x 4GB RAM (purchased in October 2013) that's starting to slow down, especially when using Safari.
Before I drop £1200 on a new MacBook Air with 500GB SSD, is it worth getting someone like macupgrades.co.uk to install 2x 8GB RAM & a 500GB SSD at a cost of around £300, or is this likely to be a false economy? Would I end up having to replace it next year no matter how much I spend on it? Would the Air still be quicker anyway?
The screen & battery on my current one are fine, and it's cosmetically decent enough too.
I spent about £900 on this one (bought it in the US when the exchange rate was better), so to spend another £300 on it would still be the same cost as a new Air. However, I could also get £200 back from this one, bringing my net cost down.