What is the best time control for improvement?

bullet is a complete waste of time, it can actually hinder progress.
by far the best is playing slow games seriously, either in tournaments or at a club. Online rapid is your best bet. i am partial to 15 10, increment or at least substantial delay is a must, otherwise you will miss out on badly needed endgame exposure.


Blitz, why do you think gms here primarily play blitz
Because they already worked so hard in classical, unlike you, they are already at the top
5 people today have referred to the classical time control in their posts.
Can someone show me where this time category is please, because I am not seeing it on this website.

The key is having time to think. The number of games you play moving every 3 to 5 seconds is not helping you at all.

I would say your best route to improvement is to play plenty of slow-paced Rapid, and to also have several Daily games (at three days per move) going "in the background".
The Rapid games give you training at thinking under pressure, while the Daily games give you a chance to really think things out, with little pressure.
Probably blitz now that im thinking.