Saf, I can increase the number, currently there are 16 posts per page. I find 40 way too much, it gets slow for slow connection speeds for sure. It is even slow to load on highspeed.
The issue is advertising, in order to incorporate advertising I had to limit the number of posts to something realistic, originally I had 10 per page, and I changed it to 16. I might change it to 25 but I would rather not go any higher.
If it wasn't for advertising boxes (which might go away not sure yet) then I can enable it so that you can change it to 1000 per page if you wish and I can have at it 25 for mine.