I can read a comic from the 2000's in just a few minutes. It's the stuff from the 60's that takes a while to read because they spelled out every little detail for you.
Also because comics today have become so decompressed. It used to be that comics routinely had up to 9 panels per page, often quite crowded with speech balloons and captions. These days it's more typical to have 2-4 panels per page and relatively little text. Back then you could have 2-3 complete stories crammed into one issue, now it typically takes 4-6 issues to tell one story because comics are written with the trade paperback compilations in mind.