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Look at http://statistics.netbeans.org/exceptions/exception.do?id=453942 the code completion seems to be blocked in org.netbeans.editor.BaseKit$InsertBreakAction.performLineBreakInsertion() by many calls to org.netbeans.lib.lexer.TextLexerInputOperation.readExisting() via org.netbeans.modules.php.smarty.editor.lexer.TplTopLexer.nextToken()
Smarty related -> reassigning
Thanks a lot for reporting that, already fixed. *** This bug has been marked as a duplicate of bug 194222 ***