When the

Indexed Draw Calls

metric is high, see if you can optimize your application’s geometry to better batch vertices into fewer draw calls, specifically those that use

glDrawElements

or its modifications.

When the

Indexed Draw Calls

metric is significantly lower than the

Draw Calls

metric, see if you can optimize your application to use indexed geometry passed to the

glDrawElements

API or its modifications, rather than

glDrawArrays

and its modifications. Additionally, check the

Vertex Count

and

Indexed Vertex Count

metrics to see how much data is being drawn without indexing to estimate the impact of such optimization.