I understood what you meant, I was just pointing out that what you said was incorrect. Even in your reply you said

I compress my files with the compression that encrypts it.

Which is still not entirely correct. The compression is not doing any encrypting. They are two separate processes that the tool you are using is presenting as a single step for convenience. You seem to know what you are talking about, and I happen to know about cryptography, but as someone else in the thread mentioned not everyone knows how these things work. If we are trying to spread knowledge and tips in this community (like your post is doing) then I just saw this as an opportunity to clarify something that was incorrect. Not for your benefit, but for others.

AES-256 is just an encryption algorithm, it doesn’t do any compression on it’s own, so it’s not quite right to say its compressed with it. Really it was compressed, then afterwards encrypted with AES-256.

Performance will likely be really bad running on a live ISO since you are going to likely be bottlenecked by read/write speeds of the usb you have plugged in. I wouldn’t use it to test performance of games.