objective c - iOS: Faster way to format html text to attributed text? -

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i have method format html text attributed text following. however, method painfully slow. there way achieve faster? 

self.textlbl.attributedtext = [[nsattributedstring alloc] initwithdata:    [html datausingencoding:nsunicodestringencoding]                                                                               options:@{     nsdocumenttypedocumentattribute: nshtmltextdocumenttype                                                                                          } documentattributes:nil error:nil];


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