Looking up the specs of a D270, looks like the memory is upgradable.
It also looks like the Intel Atom N2600 it has (from my reading) is actually a 64-bit processor
I’d probably say you shouldn’t have much trouble finding a bigger DDR3 memory stick for it for dirt cheap or free from an e-wasted notebook
Ultimately it depends if the performance loss you’re finding is memory limited or CPU limited right now, but I would think that giving it 2 or 4GB + giving it 64-bit would go a long way