Where did you read that it has more processes and higher temperatures?
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Whether you use bluetooth or usb shouldn't make a noticeable difference to the heat generated in the ps3.
"optical drive emulators" (physical mod chips)
Cobra ODE
Max supported firmware: 4.53 | 4.82 with swap-disk method
3K3Y ODE
Max supported firmware: 4.53 | 4.55 with swap-disk method
E3 Pro ODE
Max supported firmware: 4.53 | 4.66 with swap-disk method
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Sony's "Official Firmware 4.60 Update", allowed the usage of the "PS4 Controller", on the PS3 Console. sony pretty much killed the "mod chips", around that time.
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*I read something about, some "custom firmware" causing overheating because the ps3's fan was not being increased with increases in temperature ............... there's was some custom software or something for that issue. I can't be sure that, issue is long gone? Anyway.
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S.anyway.Right now the weather the ps3 controller is plugged in or used wirelessly, or the PS4 controller, is probably not an issue anymore. a few years ago during the mod chip outing with sony, this game: "Enslaved Odyssey to the West" ... had "controller issues", i think lag controls, probably affected by those series of updates from 4.54 to 4.60 ...
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as long as your below 4.53 firmware or above 4.60 firmware, you won't have a problem to worry about? Just some thoughts, but yes, I will disable "internet/network" from the ps3, once finished all game installs and updates, before using a "wireless controller" .................... its probably not enough resources to cause overheating, but if your not going to use it, then-turn-it-off=right?