Must have flexible row height for Datagrid Table

Brian Milby brian at
Thu Jul 12 01:00:50 EDT 2018

And don't forget that the last piece of the AR improvement hasn't landed
yet which will also improve DG performance.

On Wed, Jul 11, 2018 at 11:14 PM, Richard Gaskin via use-livecode <
use-livecode at> wrote:

> Tom Glod wrote:
> > Update on this ......  I'm coming to realize that dg isn't going to
> > cut it for my needs in applications where performance matters.
> >  Datagrid is built using custom properties.  which are way way way
> > slower than accessing variables  i haven't tested in a while but last
> > i did it was orrders of magnitude slower.
> I would be interested in seeing those tests.  Vars are much faster than
> fields, and still faster than custom props but much less so.
> I would imagine the bigger bottleneck is with rendering so many nested
> groups of objects.
> All that said, if you know your total size will not exceed 32k px it's
> easy enough to use one group populated with row groups copied in as needed.
> But if you need to go beyond 32k px you'll find the geometry becomes
> unpredictable with the integer limit.  For that you'd need to replicate
> Trevor's hard work in virtualizing what's on screen vs what's in memory,
> and handling the scrollbar via script rather than letting the engine handle
> it.  With all that work it may be simple to fork the existing DG if needed.
> But either is a bit of work, so I would think time spent isolating the
> true bottleneck first would be time well spent.
> Please let us know what you find.
> --
>  Richard Gaskin
>  Fourth World Systems
>  Software Design and Development for the Desktop, Mobile, and the Web
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