What can I expect (Egpu)

Long story short, moved, no room for desk/pc, sold gaming pc, bought LeGo1 windows for gaming and pc stuff.

What kind of caveats can I expect from an Egpu? Been wanting to play some more demanding games and found my old rx5700xt. What would be the difference with it hooked to the Go vs being in a pc with 32gb and a decent cpu?

Crimson Desert looks good and I’d love to play it. I know it would be just fine at 1080p with the 5700 in a normal rig, would it be at all close with the Egpu and Legion zx1?

One last question…. Have any of you installed games on an external hard drive?Is thunderbolt fast enough for gaming from an external?

Many thanks!