Gadgets

I've got a fire HD-10 and it does the job, I guess, but it's so slow as to make scrolling a basic PDF tedious to the point of being unusable. What I'm looking for is something that I can read my kindle library on, access google drive and dropbox in order to store and retrieve pdfs, epubs etc to read them on as well, a decent sized screen but nothing huge, the ability to run youtube because that's how I get some of my recipes, and a relatively snappy response (it doesn't have to be the most amazing ever, just has to react to basic things like opening or scrolling a document quickly enough to not be frustrating)