Wonder if I bought a dud 4gb USB pen

[Harsky]

I've been using a 512mb pen for a while so I decided to buy a 4gb one to replace it. But when I tried to put on a 500mb ISO on it, I noticed it was transferring it at a rate of 1mb/s. How much faster is it meant to go if it's USB2?

 

[mcp2]

There are alot of slow USB2.0 pens, I have a 1gb Lexar one that's as slow as a turtle but my 1gb Disgo one is has a very fast transfer rate.