slow key press repeating after mapping shift+delete to fn+delete

Hi, I need help. I feel shift+delete is to me easy to remember as reversely deleting text. In mac the standard one is fn+delete. So i have done a mapping, it works well. But i notice, if i want to use press without release to continuously delete letters, this mapped shortcut shift+delete works very slow and delete the letters very slowly. If i directly fn+delete, press without release, it can quickly start continuous deleting. What did i do wrong? or it is a limitation now in BTT. Thanks

what is your repeat rate set to?

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this means it would repeat every two seconds. I’d recommend to set the repeat rate to something like 0,08 and the delay to 0,3

Now it makes sense. I thought the rate means how many times faster the translated key to the original input key. Yah, change the repeat rate to 0.07 second solve my problem. Thanks.