So I was browsing artstation, developing a massive inferiority complex (as you do), when I stumbled upon this:
Began rotating the model and immediately noticed something I think Sketchfab would benefit from: no ease off on the zoom and rotate.
The model moves exactly when the cursor moves, there's none of this sliding for half a second after you've stopped moving it. For me personally it feels a lot sharper and wieldy (That's a word, right? As in opposite of unwieldy?).