Hi, I have a Latitude E7440 with the i5-4310u, SK hynix SH920 mSATA 256GB drive & 8GB of RAM. I did recently wipe the computer clean and installed a fresh version of windows 10.

I'd like to speed up the computer if possible. What upgrade would help most? 

Can I upgrade the cpu from i5-4310u to a i7-4600U cpu?

And if yes are they available anywhere? and is it a easy process?

will 16Gb of RAM help much?

would an upgraded SSD drive help?