Going to next card

[Craig Newman]

OK.

I was thrown by three things you said, “subgroups”, “dataGrid” and “query”

I now know you built your gadget from scratch, assume there is no SQL stuff going on, and that you have a lot of groups.

So I made a card with 2000 groups, each with a checkBox and six fields. I populated all the fields with random data. I then duplicated the card. That took a little while.

Without changing anything on either card, it takes 7 seconds to navigate from one to the other. Again no changes. This is on a Mac Mini, M2 a fairly fast machine.

LC was never good at this, navigating either within a stack with many thousands of cards, or from card to card where each card is heavily populated. But what is odd is that I never changed the contents of either card, simply navigating back and forth and each time got a reliable 7 second transition time. How are you getting instantaneous navigation after fooling around with the data???

Craig,

> On May 12, 2026, at 12:24 PM, jbv via use-livecode <use-livecode at lists.runrev.com> wrote:
> 
> Le 2026-05-12 11:12, Bob Sneidar via use-livecode a écrit :
>> Are you updating the datagrid using setDataOfIndex? If so, then I believe it updates all the data, not just the visible data as it does when the datagrid updates automatically. Also, are you doing a query of the data each time the card changes?
>> Bob S
> 
> As I said, I've built a custom datagrid, so I can't use the regular datagrid commands.
> Before each query, all the fields are emptied, and then, depending on the number of
> results of the query, only one row (6 fields) can be filled, or up to 1800 rows
> (10800 fields).
> Emptying the fields and then inserting new contents is pretty fast, even for sucessive
> queries on the same card. The only problem is the delay when going to the next card.
> I might be wrong, but I have the impression that the engine is storing the content of
> the card somewhere before switching to the next card, for faster display when returning
> to the first card.
> I am using LC Community 9.6.2 on Mac OS Cataline 10.15.8.
> 
> Best,
> jbv
> 
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