[SP2010] - Rating Timer Jobs

Once you have enabled "Rating" on a list or library users have the ability to rate items as shown below:

It is important to note that the average rating calculation (gold stars) for a rated item doesn't calculate immediately once been rated by a user.  SharePoint has two Timer Jobs that are responsible for calculating that average and are set to run once every hour by default:

 

User Profile Service Application - Social Data Maintenance Job  - Aggregates social tags and ratings and cleans the social data change log.

User Profile Service Application - Social Rating Synchorization Job - Synchronizes rating values between the social database and content database.

Timer job reference: http://technet.microsoft.com/en-us/library/cc678870.aspx

Change the scheduled time for both these Timer Jobs in Central Administration if you would like to  speed up the rating process.