Hello. 
I use Aruduino in windws.
When I let a loader work to send sketching, I wait for long time of 10 seconds after giving an order.
Can you perform it earlier in one second?
If I understand you correctly it probably depends on the version of the Arduino board you use. Older boards had longer bootloader delay times--as did some early versions of the most recent board (accidentally).
Which Arduino board are you using? You could update the bootloader to reduce/eliminate the delay.
--Phil.
Because I cannot express contents well, I become slightly blue.
I use firm ware of "Diecimila".
I download the sketching after waiting for about 10 seconds, but may change it to waiting more briefly for one second?