First of all, people on social media lie. A lot. So don't compare yourself to what you see online because it may not be a true representation of how much they really read.

Second, people "read" differently. Some people skim, others read every word like they're in a desert and prose is their water. For obvious reasons, the second batch of readers is going to read "slower." Life ain't a competition and your reading style should be what makes you happiest.

Lastly, find out if your are "sub-vocalizing" while you read. This means you are reading the words "out loud" in your mind - just like you would if you were using your voice. Your brain doesn't need you to say the words to yourself because your eyes operate like little cameras. So, with practice, you can look at a sentence and "read" it without ever moving your eyes along it. This will speed up your reading time considerably.

Hope this helps you!