Problem with Tiny13 start up time

Anyone konws about tiny13’s start up delay time?

There is a Delay counter (in tiny13 data sheet, described in page 31)to count the clock to control how long Tiny13 will spend on start up, as it tells in data sheet, CLKSEL[1:0] and SUT[1:0] define the delay time, when I set CLKSEL[1:0]= 10 to select 9.6MHz source and SUT[1:0]= 00 to select 14CK delay from reset, I find it costs about 240us to complete reset(time costs from power on to that program runs).

my quenstion is: how to reduce this 240us to 150us? and if it is resonable?

my other fuse bit:

BOD: enable or disable( all tried )