lol…. oh my. I am not talking about the html alone. I am talking about your overall message pertaining to IO as very low which is not.
For normal shared hosting, 1MB/s is standard and not even considered as very low. This can run html site smoothly including PHP site.
Just making sure here that users will not go to their host and complain that 2MB/s or 4MB/s is very low for them hehe.
Here are some links for users/hosts that can help them understand IO especially if they are using Cloudlinux:
Some users also connect this with network so they thought it is low: