When viewing a graph or a screen with graphs with the interval set to one day, graphing performance is very poor. When using any other interval, e.g. multiple days, weeks or 5 hours, graphing performance is fine. Perhaps this is an indexing issue ?

We are using MySQL 5.0.45 as a backend and have created the three indexes when migrating from 1.6.2 to 1.6.3 and 1.6.4.