Controversial topic - Heel toe makes you slow

[The Doctor]

On the street i do it everytime, to lower the load on the drivetrain while downshifting, at first i did it for fun, now it has become a habit, in my daily i've perfected it to downshifting without using the clutch.
On the track i rarely do it, just try to bring up the revs a bit just before i release the clutch, that's it