Some of this stuff is actually stuff I figured out how to do myself...
I've been making comics for almost a year and this is honestly the best way to make them.
I tend to make my word bubbles before I've even done my inking (I do everything digitally so this is possible) so that I can cram all the art out without having to break my streak.
I remember when I could only make one page per update because I was using sluggish techniques.
A couple more tips though, particularly for more graphic-novel style comics:
Get a small sketchbook - I mean like A6 size or something. Use it to map out your sketches before you even sketch the actual pages. This way you can speed up the otherwise slow process of working out your panel shapes. It's also easier to notice when your panels are getting boring.
Turn it on its side so it is landscape to make it more economical - you can do two pages per side.
When converting from script to sketch, if you haven't split it into pages yet you can just do it by highlighting - use two colours, and highlight everything that goes on one page. This way you can also do it as you go along if you prefer a more spontaneous approach. It's just a really quick and simple way of breaking a script up without ruining the reading flow.
This is even better on the computer because you can adjust the highlight at any point. In google docs, you don't even need two colours - just use the "comment" feature, highlight the content and write the page number in the "comment".
If this helps anyone let me know! This is just what I do.