That machine certainly shouldn't be slow, I'd put my money on it being the HDD so swap that out for an SSD first, then see what it's like.
Upgrading the RAM will only make a big difference if you are using more than it has at the moment which I doubt you are based on your usage. Try the SSD and see what difference it makes.
From what I can see the CF-C2 has a 4th generation Haswell chip, I can't find any reference to them ever having a first gen, therefore it certainly shouldn't be slow.