You can now control the number of items shown in your homepage feed. Most of the sites are not using Facebook in their feeds and 10 items is a bit much. Especially since the new items on there are sometimes 50-60 days old. Log into the CMS and on the site editor page you can change the number of the items to a lower number if you like. I find that 5 is a good number for most sites as far as date of items as well as page length. Play with it to find the number you like best depending on the frequency of news/spotlights/Facebook posts for you. Try not to go too short or too long though.
The feed generates itself every 30 minuets so the longest you would have to wait would be 30 minuets to see the change.