_cat/indices a little slow

hi there~
in "Discover" i search some keyword and get response in a acceptable time,but when i check status of my indices, it cost more seconds then before.
Is this because the data is getting bigger? cause it responses quickly when there's only one or two indices, but down in a few(about 15 indices at present).

lastly, how can i get a better query response time???
thank you~~

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