Kibana dashboards - global filter vs individual filters performance

[ARDiver86]

Right now I have three objects on a dashboard (one saved search, two data table lens) that are using the logs-system* namespace. Each LENs is using this filter:

event.dataset:"system.system"

Is there any performance increase if I were to apply this to the global filter for the dashboard instead of on each object? I have tried testing this and can't tell a difference but I think that is because Elastic is caching it when it is first queried. So technically it is hard for me to test this theory. I know it makes more sense in this case to apply it globally but I was just curious if it would make any difference.

On a side note:
If the first object is a saved search and then other two are aggregations of the same data in the saved search, can Kibana/Elastic not use the data it queries from the saved search to build the data instead of querying the indices all over again?

[bhavyarm]

@devon.thomson / @Hannah_Mudge any inputs please?

Thanks,
Bhavya

[devon.thomson]

There should be no performance difference at all between one global filter, and having each chart individually filtered.

Currently, Kibana sends bulk requests for all charts on a dashboard. Elasticsearch has its own caching mechanisms that make this pretty efficient. That said, there is always room for improvement, and a caching layer like that has been discussed in the past.