# Trend Refresh Rate

When creating a trend object at design time, set the trend Refresh Rate no faster than the time it takes to put a data point on a trend. Drawing extra data points only consumes additional memory.

The speed at which data points can be drawn depends on the time span specified for the X axis, and the width of the trend object.

To calculate the fastest possible refresh rate, divide the number of seconds specified for the X-axis by the width of the trend object in pixels:

(X – Axis (Seconds))/(Trend Object Width in Pixels)

## Example

In the following trend object, the X-Axis Time Span = 10 Minutes = 600 seconds.

The Trend object's Width = 500 pixels.

Fastest Possible Refresh Rate = 600 seconds/500 pixels = 1.2 seconds/pixel

This trend object only shows a new pixel of width every 1.2 seconds. Therefore, setting the Refresh Rate higher than 1.2 seconds only consumes extra memory without showing more data.

Tip: | The X-axis cannot be changed dynamically at run time.

## See also

Options on the General tab of the Trend Object Properties dialog box

Set up the horizontal axis for the trend

Set up common properties

Keywords: best practice, trend