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Nikhil Bujade
Opening visualforce page in an iframe from lightning loading slowly? Performance issue?
Anyone facing the same?
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There are mulitple redirects done before page is loaded if we use relative url, resulting in Performance issue in loading.
Try using absolute URL, please visit below article.
http://ashishsfdc.blogspot.com/2018/09/loading-visualforce-in-iframe.html (http://ashishsfdc.blogspot.com/2018/09/loading-visualforce-in-iframe.html" target="_blank)