You can't upgrade the RAM. You can change the SSD but it won't necessarily increase the speed and is rather pricy. What do you expect from the external SSD? It won't be faster than the built in one.Didn’t really buy, but inherited my wife’s old MBA 11in Mid-2012 model (i7).
Unfortunately it’s only got 128gb and 4gb ram, and I able to increase the ram and hd on this model or not? Anything else I can do to make it zip a bit more? I’ve given it a fresh install of High Sierra, and plan on picking up and external ssd to run the most of my apps and data, but wondered if I could do anything to the internals?
I find it hard to believe that it is that slow. I have a 2013 11" with the i5 and it also only 4GB RAM and it still works very well. You might want to consider downgrading though. I think mine runs still on El Capitan (or even Yosemite?) if I am not mistaken. I have high Sierra on a 2013 13" MBA with the i7 and 8GB RAM and it doesn't feel faster unless I use up a lot of RAM of course.