It is said that "time is money," and one can budget them similarly. If you lack the time to read the meager amount of text presented here before interjecting, then what you have to say is, in all likelihood, rushed in equal measure. Make the time and get caught up. No one's asking you to write a compare-and-contrast assignment or anything.
In the end, you'll either read it or you won't. But "TL;DR" never comes off as anything other than snotty and abrasive.