# OpenLayers Mousewheel Interval Example

performance, zoom by wheel
Let OpenLayers send less tile requests to the server when wheel-zooming.

This example shows how to configure the Navigation control to use the mousewheel in a less server resource consuming way: as long as you spin the mousewheel, no request will be sent to the server. Instead, the zoomlevel delta will be recorded. After a delay (in this example 100ms), a zoom action with the cumulated delta will be performed.

Cumulative mode. If this mode is deactivated, only one zoom event will be performed after the delay.