Random indicator updates in TS

[Christopher McMurry <cmcmurry@xxxxxxx>]

This is a question regarding TS 4.0, build 20.

I have 8 different indicators applied to a realtime chart.  When first
applied to a chart they take quite a long time to process.  In realtime,
however, with each newly updated bar the calculation of all the
indicators is pretty much instantaneous.

All indicators are set to NOT update every tick.  So you would expect an
update only at the end of the bar/start of the next bar.

This is what happens, usually, but once every 20 minutes or so, all of
the indicators get processed using *all* the data on the chart (IOW, I
get a durn hourglass that lasts too long).  These random updates do not
even occur at the end of a bar, they occur in the middle of a bar (IOW,
on a 5 minute bar, e.g., @ 10:17).

Does anyone have any ideas why this is happening?

My datafeed is FutureSource.

Thanks!  :)
Chris McMurry