[torkelo]

Grafana is mainly built around time series databases that have good roll ups and are usually quite fast. Graphite queries usually only take 50-150ms (except some rare cases). This is changing a bit with newer slower time series databases that don't have good roll ups or are generally slow.

The main problem with prefetching or doing delta fetches is that some queries depend on the whole time range to execute (like moving average, integral, derivate).