Personally, the things that I've done recently is the following:
1- Thumbnailing in traditional, since, to me is way faster than doodling in the computer. I feel I have a better grip and waste less time since I avoid pressing Ctrl+Z besides I can glance at the script without switching windows
2- I make the panels of the entire chapter in a big Canvas (9000 x 9000 pixels at 200dpi approximately), then start doing a rough sketch. Personally I like to do this since I don't force my computer's memory/graphic card, neither I have to scroll and can work more comfortably.
3- If there are panels that don't require background or are very complex, I just make a clean sketch right away and keep them ready to ink (Sometimes I even ink them in between of the following things)
4- After the rough sketch, I like to grab my 3d backgrounds (CofCof, done in the Sims 2), which are basically screenshots that I later accomodate to the panel.
5- After that, I place down the 3d models from CSP that I mostly use for fullbody views or very specific poses, and as well, I can arrange them so they align better with the backgrounds.
6- Then, I sketch and ink everything. I also do the lineart for the backgrounds since I want it to some or less blend a bit with my drawings.
- Another cheat for inking is working in a Vector Layer, and using a bigger brush that later you can reduce it's parameters and make the lines smaller. That way, you avoid focusing in too many details and can keep up with the core lines first.
- Besides doing this, you can also save time by working in Vector lines, while using the Vector Eraser you can remove lines quicker especially if these are clashing against another, this is very good for detailed hair.
7- Color base everything, then apply soft shadows and lights to the whole panel
- Another thing that helps a lot to save time is having a color palette, to quickly pic the colors especially of the main characters
- This is a life saver, this bad boy here has made base coloring extremely easy
8- Apply solid shadows and lights, highlights, minor ambiance corrections, details and such.
9- Lettering and speech-bubbles
- Another way to save time, is to have the script already corrected and clean, the only thing left is to copy-paste the text.
- I use a Speech-Bubble brush, so basically I encapsulate the words and then correct it a bit with the Operation section, instead of searching which speech-bubble I'm gonna use.
10- Export everything in the format of the platform I publish, I know by memory this, so it really doesn't take much time (Webcomics App, Webtoon Canvas, Tapas.Io and the High-Res version)