* Has performed: This is the correct past participle of the verb "to perform." "Performed" is a verb.
* Has preformed: This is a possible misspelling of the past participle of the verb "to preform," which is an obsolete word meaning "to form beforehand." If used, "preformed" would be a verb.
To determine the correct part of speech, you need to consider the context of the phrase. If it's intended to mean "has done something," then it's the verb "performed." If it's intended to mean "has been formed beforehand," then it's the verb "preformed," but this is an uncommon word.