Just a thought...I don't want to see any posts for sub-forums I don't follow or interest me.
You could accomplish this by only following those forums that you are interested in.
The when accessing "new posts" set your filters to only display followed content. (make it the default.)
Just in case you aren't certain how to access new posts...
How To Find New Posts & Use Filters
From the navigation, near the upper right-hand corner, click on the popular button.
This will open a new page where you can click to choose “new posts”.
You can also choose to set special filters or mark all posts read on that same page.
Let me know if that helps...