I believe that was answered, the FBI simply ran it on better and faster hardware, with better uptime.
I do not believe the FBI continued to operate it as is on the criminals hardware, I believe they took possession of the "server" then likely imaged it and spun up a new instance of the site on the FBI own servers, these servers likely had much better specs, and a much better connection to the internet.
I do not believe the FBI continued to operate it as is on the criminals hardware, I believe they took possession of the "server" then likely imaged it and spun up a new instance of the site on the FBI own servers, these servers likely had much better specs, and a much better connection to the internet.