putting tempo

im not talking about reading the green.im talking about the time from when you address the ball to impact.one of my playing partners seems to hit the ball straight away and i say to myself you havent give that putt enough thought, but hes a good putter,and i wonder how he does it. another partner takes all of 30 seconds which i feel is too long[too much thought]as for me im somewhere in between the two at about 10 to 15 seconds.i had a chance of a 73 today ,but had a bogey on the last 3 holes due to my putting i spent too much time thinking about the putts iknow i did. when im putting well i take around 10 seconds with a clear positive mind , but when the pressure on i slow down and have negative thoughts. ps it was a medal comp today

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