While the idea of decimating is valid, it does complicate the work if zooming is required.
I BELIEVE that behind the scenes the charts has to be doing some automatic decimation due the reason mentioned by others. The amount of CPU required to update a chart can often be reduced by...
1) Reducing how often the chart is updated - Throw more data at it less often.
2) Avoid complicated plotting styles - Step type plots require more work.
3) Avoid auto-scaling if possible - A rescale requires the whole chart be re-computed.
4) Defer Front Panel Updates - Defer the update, apply the updates, let LV update the chart without updating the actual display, then undefer the udpates.
Just my 2 cents,
Ben
