This may be something most experienced pen users do without thinking, but I've only just recently begun the habit from something I read here. Placing and replacing the pen cap with the pen held upright has made all the difference in the world in helping my pens start writing without having to spend several moments repeatedly drawing check marks on a piece of scrap paper.
It was like trying to start an old car on a cold morning. So frustrating.
Perhaps also aiding in this new found ease of starting was filling up with Diamine inks rather than an old bottle of Leveger black. Who knows who manufactured it for them. My Parker 45 and Super 21 (Medium and fine respectively) are the best behaving pens you could ask for now. They start fast and don't dry out if I pause for few moments.