THS8200: How to reduce t the rising/falling time with VGA output

Hi,

My customer is outputting 1080p60 with PC VGA interface from THS8200. And they found the rising/falling time of VGA output signal is long as about 9ns. It is much longer than the time I found at .

Would you pls kindly advise if there is any register which we can adjust the rising/falling time of output signal?

If not, do you have any suggest to reduce the rising/falling time by HW method?

Thanks.