Slang term question

After the end of a match where killer got a 4K, they said “Nice hotswap. How’d that work out for you?” They didn’t give any indication who they were talking to, but I’m confused on what they meant. Looking it up, it seems to be replacing pieces while the computer is still running, but I’m not quite sure why that was a thing to comment on or why the tone seemed disapproving? Was he saying someone was cheating somehow?

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