I was using multiple tabs to report posts.
I've ran into the limit so many times. I now report in one tab, wait for it to finish loading the page, close the tab, and only then report the next tab. This makes reporting 50 posts quite slow, so I don't often report that many at once anymore.
There was one person (presumably) making the same 3 posts with several dozen accounts that I found via the patrol. This was presumably some kind of spambot, so time is of the essence to get these posts removed before search engines can index the posts. I could create a tool that queues my reports, but that is besides the point. These posts need to be removed quickly, and I believe I have reported enough posts, and have contributed enough (look at my merit) to have a lower wait time.
But like other said, 4 seconds is very little duration. And concern is if you are trying to catch up with it means you are trying to keep your hands busy like a robot. Wanting to continue with this pace with your human hands - may end up breaking your keyboard :-D
I had identified many posts that had the same problem. I kept the report message in my clipboard and pasted the message in each report as a way to quickly report the posts.
Just queue things up while you're not prepared to post. If anything, you can always sneak a post in while your reports are being sent - it'll only pause one - and continue in the list.
I am not concerned about my ability to make many posts quickly. I ~always spend much more than 4 seconds on each post I write.