Too much heat *damages* electronics. When modern computers and phones get near a dangerous temperature, they slow themselves down on purpose to avoid producing more heat so they do not get so hot that they are damaged.
On its own heat does not slow down electronics. It has some negative effects on some types of electronics but screens and batteries may be more effective at high temperatures. However extreme heat will damage all types of electronics (just like any item) so we artificially limit the use of hot electronics for protection
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