As a tech conference audience member, one of my biggest pet peeves is people using roughly 70+ percent of their talk to introduce the background/rationale of their tool/library/use-case/workflow/whatnot without even showing precisely what the tool does or how to use it practically. Chances are, most people in the audience are in the room _because they are already on board with your rationale_.
A fake example: If you're giving a talk on your new Linux shell that 's way better than Bash, you don't need to spend the first two-thirds of your talk explaining what Bash is and what its weaknesses are. Your audience probably knows what Bash is and knows enough to be interested in an alternative. Don't bore them out of the room.
A fake example: If you're giving a talk on your new Linux shell that 's way better than Bash, you don't need to spend the first two-thirds of your talk explaining what Bash is and what its weaknesses are. Your audience probably knows what Bash is and knows enough to be interested in an alternative. Don't bore them out of the room.
TL;DR: Show first, tell second.